This report follows shortly after Square mentioned that Eidos could perhaps one day take on Final Fantasy. Currently Eidos Montreal is working Thief and a new Deus Ex.
There are few details at the moment thatcould gleam from their sources. Thief is due out in February 2014 for Deus Ex going next-gen sometime.
The most recent release from Eidos Montreal is last week's Deus Ex: Human Revolution Director's Cut.