Eidos Montreal will reveal a second project on May 11, according to a page from the latest issue of EDGE Magazine. The studio is currently working on Deus Ex 3, the next installment of the first-person hybrid franchise started by Ion Storm in 2000.
Some are speculating that a new version of Thief, the stealth franchise originally put together by the now defunct Looking Glass Studios, could be what's revealed. This is fueled in part by a story from last month where Eidos Montreal put up a post using a Thief-like font. The announcement date is also confirmed on Eidos Montreal's Twitter account.
As of publish we've yet to get any kind of official response to questions regarding the announcement. We'll update with anything else that's made available before May 11.