I wouldn't expect any "Triple A" titles, but given that Microsoft is giving away games, and likely they'll want to promote some of their in-house titles, I think "Kameo" would be a good bet, and it's possible they would cross-promote some "Rare" titles.
I'd like if "Perfect Dark Zero" was one of those titles, since it's an "okay game", but wasn't worth buying at full price, and by the time I felt like playing it, it was only available used at Gamestop (and the one disc they had... was in really bad shape).
And I think there are plenty of Banjo-Kazooie fans who are hoping one or two of the Xbox 360 titles will be free.
Dead Space wouldn't surprise me. The others seem a little too generous. Maybe Resident Evil 5, Gears of War 2, Bioshock, Left 4 Dead, Darksiders, Street Fighter IV vanilla and something from the COD series. That's more or less the kind of material I'm expecting.
I've somehow never managed to play it or add it to my collection
same here, i have a feeling it will be one of the free games, i posted that before i found out mirrors edge 2 is in the making, so i reckon they may give us this one to get everyone exited for the second instalment (although im sure everyone who has played the first already is)
Crappy spelling due to my iPod. I..am..Kolos, the great Leviathan._