E3 Rumour Rotisserie: Microsoft Unannounced Exclusive AAA Title

E3 is nearly here - and all the announcements have nearly been guessed at or leaked... except this one (and probably 10k more).

This comes from Aussie site, Gameplayer (a schooner of New to you):

"We got word today, however, that one of the four slots (at E3) is for an unannounced new AAA exclusive. 'AAA' is their word not ours, and it was all we were told. Excitement, much?"

Of course, it must be Monster Hunted Iron Gear Solid Wake Halo 4... or something.