Rorate Caeli has more of the translation of Pope Francis' talk on the liturgy today. Praytell also has an interesting comment on it which has always been my position as there is no way that the Church would say that an Ecumenical Council was wrong, undo it, that Sacrosanctum Concilium was wrong, undo it, or that papal promulgation of the most authoritative types were wrong so let's undo it. Pope Benedict never endorsed such a thing either.
But this is what Praytell writes:
In his remarks declaring that the reform is “irreversible,” Francis seems to be signaling a couple of things.
- He is dubious about any restorationist “reform of the reform.” While some elements of the liturgy that were abandoned in the course of the reforms of the 1960s might be reintroduced (e.g. the way the Pentecost Vigil was restored in RMIII), there will be no wholesale movement toward something resembling the Mass of the 1962 Missal (as some “traditionalist” liturgists might hope).
- The work of liturgical reform is ongoing. But Francis does not seem to conceive of this work in terms of more ritual revision (as some “progressive” liturgists might hope), but rather of continued internalizing the reforms of 50 years ago.
This is Rorate Caeli's more detailed account of the pope's talk:
Pope Francis gave an address on the liturgical reform of Pope Paul VI today, speaking to participants of the 68th Italian National Liturgical Week. In it, Francis declares: "After this magisterium, after this long journey, we can affirm with certainty and with magisterial authority that the liturgical reform is irreversible."
There are two directly linked events, the Council and the Reform, which did not flourish suddenly but after long preparation. What was called the liturgical movement testifies to it, and the answers given by the Supreme Pontiffs to the hardships perceived in ecclesial prayer; when a need is sensed, even if the solution is not immediate, there is a need for it to be put in motion.
The Second Vatican Council made later to mature, as good fruit from the tree of the Church, the Constitution on the Sacred Liturgy Sacrosanctum Concilium (SC), whose lines of general reform respond to real needs and to the concrete hope of a renewal; it desired a living liturgy for a Church completely vivified by the mysteries celebrated.
The direction traced by the Council took form according to the principle of respect for sound tradition and legitimate progress (cf. SC 23)  in the liturgical books promulgated by Blessed Paul VI , well received by the same bishops who were present at the Council, and for almost 50 years universally used in the Roman Rite. The practical application, led by the Episcopal Conferences of their respective countries, is still ongoing, since it is not enough to reform the liturgical books in order to renew the mentality. The books reformed according to the decrees of Vatican II have introduced a process that demands time, faithful reception, practical obedience, wise celebratory implementation, first of all, on the part of ordained ministers, but also of other ministers, cantors, and of all those who participate in the liturgy. In truth, we know, the liturgical education of pastors and the faithful is a challenge to face ever anew. The same Paul VI , a year before his death, told the cardinals gathered in Consistory: "The time has now come definitely to leave aside divisive ferments, which are equally pernicious on both sides, and to apply fully, in accordance with the correct criteria that inspired it, the reform approved by Us in application of the wishes of the Council." 
And today, there is still work to do in this direction, in particular by rediscovering the reasons for the decisions made with the liturgical reform, by overcoming unfounded and superficial readings, partial receptions, and practices that disfigure it. It is not a matter of rethinking the reform by reviewing its choices, but of knowing better the underlying reasons, even through historical documentation, of internalizing its inspirational principles and of observing the discipline that governs it. After this magisterium, after this long journey, we can affirm with certainty and with magisterial authority that the liturgical reform is irreversible.
The task of promoting and guarding the liturgy is entrusted by right to the Apostolic See and to the diocesan bishops whose responsibility and authority I rely on very much at the present moment; National and diocesan liturgical pastoral bodies, training institutes and seminaries are also involved.
[...]Among the visible signs of the invisible Mystery there is the altar, a sign of Christ, the living stone, rejected by men but it has become a cornerstone of the spiritual building where worship is offered to the living God in spirit and truth (cf. 1 Pt 2.4; Eph 2:20). Therefore, the altar, at the center toward which our churches converge,  is dedicated, with chrysm, incensed, kissed, venerated: towards the altar, the eyes of those praying, the priests and the faithful, are called together by the holy assembly around it [the altar];  Upon the altar is placed the Church's offering, which the Spirit consecrates to be a sacrament of the sacrifice of Christ; from the altar the bread of life and the cup of salvation are bestowed upon us "for we become one body and one spirit in Christ" (Eucharistic Prayer III).
 The reform of the rites and the liturgical books was undertaken immediately after the promulgation of the Constitution Sacrosanctum Concilium and was brought to an effective conclusion in a few years thanks to the considerable and selfless work of a large number of experts and bishops from all parts of the world (Cf. Sacrosanctum Concilium, 25). This work was undertaken in accordance with the conciliar principles of fidelity to tradition and openness to legitimate development (cf. ibid . , 23); and so it is possible to say that the reform of the Liturgy is strictly traditional and in accordance with “the ancient usage of the holy Fathers” (cf. ibid. , 50; Institutio generalis Missalis Romani, Prooemium, 6). ( John Paul II , Lett. Ap. Vicesimus quintus annus, 4).
 "The pope’s attention is drawn today once more to a particular point of the Church’s life: the indisputably beneficial fruits of the liturgical reform. Since the promulgation of the conciliar Constitution Sacrosanctum Concilium great progress has taken place, progress that responds to the premises laid down by the liturgical movement of the last part of the nineteenth century. It has fulfilled that movement’s deep aspirations for which so many churchmen and scholars have worked and prayed. The new Rite of the Mass, promulgated by Us after long and painstaking preparation by the competent bodies, and into which there have been introduced-side by side with the Roman Canon, which remains substantially unchanged, other Eucharistic Prayers, has borne blessed fruits. These include a greater participation in the liturgical action, a more lively awareness of the sacred action, a greater and wider knowledge of the inexhaustible treasures of Sacred Scripture and an increase of a sense of community in the Church. The course of these recent years shows that we are on the right path. But unfortunately, in spite of vast preponderance of the healthy and good forces of the clergy and the faithful, abuses have been committed and liberties have been taken in applying the liturgical reform. The time has now come definitely to leave aside divisive ferments, which are equally pernicious on both sides, and to apply fully, in accordance with the correct criteria that inspired it, the reform approved by Us in application of the wishes of the Council." (Alloc . Gratias ex animo, June 27, 1977: Teachings of Paul VI, XV , 655-656, in Italian 662-663).
 Cfr. General Instruction of the Roman Missal, n. 299; Rite of the Dedication of an Altar, Preface, nn. 155, 159
 "Around this altar, we are nourished by the body and blood of your Son to form your one and holy Church" (Rite of the Dedication of an Altar, n. 213, Preface).