Ken Levine hints at big news today, Bioshock Vita anyone?

A tweet from Irrational Games' Ken Levine has hinted at some big news today (or tomorrow) depending on time zones. Since Bioshock Infinite is pretty much a known entity, could it be the unveiling of the PS Vita's Bioshock game? As long as they have taken the time to develop it properly (cough, cough Colonial Marines and Black Ops cough, splutter).

Any voyage through Rapture will be awesome on the go, and even if its a diversional tale through the original game and maps, I'd still love it. UPDATE: Guess not, it was another Infinite video, I think we need a code of conduct where industry peeps stop teasing and be more specific.