These letters has been sent by e-mail to about 3100 Diocesan Cardinals, Archbishops, Bishops and and Auxiliary Bishops, which is about 97% of all.
January 13th, 2019 – Sunday after Epiphany, Feast of the Holy Family:

Letter I
Vatican II and the hermeneutic law of Pope John XXIII
Vaticano II e la legge ermeneutica di Papa Giovanni XXIII

English
...
It is a fact that the most of you were ordained after the Second Vatican Council. At the opening of the Council, only the eldest among you were about 19 years old and maybe young seminarians, while others were still in their childhood or even among the growing population of “not-yet-born”. Therefore, the Council is becoming more and more a historical event of which one has only second hand knowledge, which confronts us with contradictory ways of understanding the underlying hermeneutics: ‘continuity’ and ‘discontinuity’ being the main problems.
...
Italiano
...
E’ un dato di fatto che la maggior parte di voi siano stati ordinati sacerdoti dopo il Concilio Vaticano Secondo. All’apertura del Concilio solo i più anziani tra voi avevano circa 19 anni e forse erano giovani seminaristi, mentre gli altri erano ancora nella loro infanzia o addirittura fanno parte dell’attuale crescente popolazione di coloro che “non erano ancora nati”. Perciò, il Concilio sta diventando sempre più un evento storico del quale si ha solo una conoscenza indiretta che ci mette di fronte a modi contraddittori di sottolineare principalmente le ermeneutiche della 'continuità' e della 'discontinuità'.
...

Background attached to the first letter
Vatican II, a Council in Threefold?


What were the stated goals and objectives of the council? The primary rule set by Pope John XXIII in his opening address lays out the substantial law for the Council itself as well as for interpreting the Council documents. The primary rule was that the council was to ‘never depart from the sacred patrimony of truth received from the Fathers’. Accordingly, the Council should be understood as a renewal not only in a kind of continuity with, but more explicit in unity and in accordance with the Doctrine taught by the Fathers. Consider the following quotes taken from the openings address on October 11, 1962
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February 2nd, 2019 -- Presentation of the Lord - Purification of the Blessed Virgin Mary
2 febbraio 2019 -- Presentazione del Signore - Purificazione della Beata Vergine Maria

Letter II
The stakes are too high to simply ignore this fact; a proposed solution
La posta in gioco è troppo alta per ignorare semplicemente questo fatto; una proposta di soluzione

English
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Because the problem started due to the lack of 'a gracious collaboration concerning the inspiration of the Holy Spirit' and continued with the introduction of the vague 'spirit of the Council' in place of the clear hermeneutic rule set by Pope John XXIII, this problem is in essence of a supernatural origin.
... A public Confession of Faith shall be made by all the Clergy and Hierarchy. This can follow the model of an extended Creed, like the 1968 Creed of Pope Paul VI (Motu Proprio Solemnia Hac Liturgia, June 1968)....
Italiano
...
Poiché il problema è iniziato a causa della mancata 'condiscendente collaborazione su ispirazione dello Spirito Santo' ed è proseguito con l'introduzione, al posto della chiara regola ermeneutica, del vago 'spirito del Concilio' imposto da Papa Giovanni XXIII, questo problema ha in sostanza un'origine soprannaturale.
... Una Confessione pubblica di Fede dovrebbe essere fatta da tutto il Clero e la Gerarchia. Questo potrebbe essere fatto seguendo il modello di un Credo esteso, come quello di Papa Paolo VI (Motu Proprio Solemnia Hac Liturgia, Giugno 1968). ...
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February 8th, 2019

a surprising and unexpected support by two Cardinals

Cardinal Burke launches his personal website

Burke

'Welcome to my personal website. I am pleased to communicate with you. It is my hope that your visit will be a source of encouragement to you. For my part, the website is a means of carrying out more fully my mission as a Bishop and Cardinal in the Roman Catholic Church, especially the teaching of the Church’s doctrine and discipline. In a particular way, I hope that your visit will inspire you to pray for me. Please let me know of special intentions which you wish me to remember in prayer. May God bless you and your home.'

Raymond Leo Cardinal Burke

Cardinal Müller issues a Manifest of Faith

Müller

As described by Sandro Magister:

If there is a forerunner of this 'Manifesto of faith' from Cardinal Gerhard Müller. released today all over the world, it is the 'Credo of the People of God' proclaimed in 1968 by Paul VI.
Then as now, the Church was in a tempest and its very faith was wavering. Paul VI felt it his duty to reaffirm the pillars of Church doctrine. Today, giving this public testimony of faith is the cardinal who was prefect of the congregation for the doctrine of the faith from 2012 to 2017.
Müller decided to take this step at the impetus of requests from 'many bishops, priests, religious and laity of the Catholic Church,' concerned over the 'ever more widespread confusion in the teaching of the faith'.
As an outline for the 'Credo of the People of God' Paul VI adopted the 'Credo' of the council of Nicaea. Cardinal Müller has instead taken as the guideline for this 'Manifesto of faith' the Catechism of the Catholic Church, to which the numbers in parentheses in the text refer
You can find the text HERE in Italiano, English, Espagnol and Français
HERE
You can find the Manifesto of Faith in Dutch:
HIER

February 19th, 2019

the Open Letter by the Cardinals Burke and Brandmüller to the Presidents of the Bishop Conferences, gathering the coming days in the Vatican on the sexual abuses.



Sexual abuse is blamed on clericalism. But the first and primary fault of the clergy does not rest in the abuse of power but in having gone away from the truth of the Gospel. The even public denial, by words and by acts, of the divine and natural law, is at the root of the evil that corrupts certain circles in the Church.

Find HERE the text in Italiano, English, Espagnol and Français

February 20th, 2019

Letter III
a third Open Letter to all diocese Cardinals, Archbishops, Bishops and Auxiliary Bishops


bugnini May the acts by these Cardinals encourage you to present the result of my analysis concerning the roots of the 'confusion, bitterness in human relations and fratricidal wars' in the Church since Vatican II in the first letter and the proposed solution in the second letter to our Holy Father!

Furthermore, I would like to use the opportunity of this letter to present you a new unexpected confirmation of some details of my analyses, that I discovered last month in Yves Chiron’s biography of Mgr. Bugnini

Please find HERE the text of the Open Letter to the Bishops