In a teaser for this week's installment of Spike TV's GameTrailers TV, host Geoff Keighley promises the world premiere trailer for a surprise PS3 sequel.  No clues are given.  So what could it be?  A few possibilities pop to mind.

New installments of Killzone and Resistance have been rumored for some time now.  No concrete information has been released on either game, but these are both important titles for Sony.  Resistance developer Insomniac Games has an impeccable record of delivering games on time.   The studio dropped the stellar Ratchet & Clank Future: A Crack In Time last Fall.  That pretty much makes this a Resistance year.   Guerrilla Games, on the other hand, is notorious for the amount of time they took to get Killzone 2 out the door.  Can they knock out another Killzone this quickly?

It seems likely that this mystery game, whatever it may be, will release this Summer.  Why else would it be announced now?  Both Killzone and Resistance have traditionally been fourth quarter games, and fourth quarter games are usually revealed at E3.  However, Halo: Reach hits this fall, and Sony may not be too eager to pit its first-party shooters against Bungie's behemoth.  In that light, perhaps we could see summer releases for Killzone and Resistance.  Then again, perhaps not.

So what else is there?  How about PS2 series that have yet to make the jump to the current generation.  The first title that pops to mind is Jak and Daxter.  Personally, I'd love to see a new console installment of this series, particularly if it hued closer to the platforming of the first game rather than the gunplay of later installments.  But developer Naughty Dog is fairly reeling with the success of Uncharted 2, which they are continuing to support with downloadable content.  Could they be ready to move away from their breakout hit so soon?  Seems unlikely.

Finally, there has been nearly endless speculation about a new Twisted Metal game from David Jaffe.  He did confirm, on a recent episode of 1up's "4 Guys 1 Up" podcast, that his new game would feature vehicles.  He's also written on his blog that if he were to develop a new Twisted Metal, it would be a full-on re-boot, and he would consider it, " a brand new series/game/franchise."  Now, that sounds like a summer release to me.

What do you think?  Is one of these the mystery reveal?  Or will it be something else?  We'll find out soon enough.  GameTrailers TV airs Thursday night/Friday morning at 12:30 AM on Spike TV.

Source: GameTrailers, davidjaffe.biz, 1up