Big Vita reveal coming today (before the Sony show)

Geoff Keighley has tweeted a big reveal will be made for the PS Vita later today, but ahead of the main Sony show which happens at 2AM UK time. The reveal will be livestreamed on Spike TV at 4:50 UK time, any bets on what it will be? A price cut, a new game or some big new service?

There's a GameTrailers live stream starting soon as the west coast gets moving. Likely a third party title, will Activision be taking the wraps off a new CoD or Black Ops game, will Ubisoft show the next Assassin's Creed Phoenix Rising title or will it be something all-new from an unexpected source?