“A surprise Sony sequel” announcement tomorrow

Sony is set to reveal a new PlayStation title this week; The promo for tomorrow’s episode of Gametrailers TV is teasing “a surprise Sony sequel” that will be revealed through a world premiere trailer on the show. There’s not a hint in sight as to what it could be but the preceding mentions of Uncharted 2, Heavy Rain and God of War III lead to believe it won’t be PSP title.

What then? MotorStorm 3, Resistance 3 (update: nope, not R3), something old and forgotten?