Those discussions are pretty much over. The Catholic Church has an Agreed Christological Statement with the Oriental Orthodox Churches, and another one with the Church of the East. In both of them, the parties acknowledge that the share the same understanding of the relationship of the human and divine in the God-man Jesus Christ. Neither side is required to accept or reject the formulations of a specific Ecumenical Council.
As to the Photian Councils, please try to remember that the list most commonly used by Roman Catholics was complied in the 17th century by St. Robert Bellarmine for polemical purposes, and has no real magisterial standing. In fact, as Francis Dvornik demonstrated irrefutably, the acts of the Council of 869-870 were overturned by that of the Council of 879-880, which was in fact accepted and ratified by Pope John VIII, and was acknowledged as ecumenical by the Church of Rome for more than two centuries--after which it was flushed down the memory hole.
For my part, we acknowledge and celebrate seven Ecumenical Councils in our liturgy. When they add more to the calendar, I'll reconsider, but until then, there really are only seven Ecumenical Councils at most.
