If the clip above, taken from Finnish magazine Pelaaja and found via Twitter, is anything to go by, it would seem that we're soon going to have a few new details about Halo 4. The entry says that on February 29th there'll be an Xbox 360 Showcase in San Francisco, with a special appearance from Halo 4. It's certainly not impossible and, given that the game is still on for a 2012 release, we're probably going to start hearing about it sooner rather than later.
The question is not really when we'll find something out – it can't be too long away even if this turns out not to be true – but how much we'll find out. Are we going to get a full blown trailer, detailing plot, gameplay advancements and multiplayer or are we going to be teased right up until the likely November release date?
A big blow-out may be enough to distract disillusioned 360 users from complaining about a lack of exclusives just long enough to announce some stuff at E3, although it's more likely that a significant amount of the 360 show at E3 will be dedicated to Halo (and Call of Duty).