Perhaps that 1.6Ghz rumor is only pertaining to the cheaper Xbox TV model? The core edition probably will higher clock speeds, if not, who really cares?
Bring on a new Metroid game from Retro and The Last Story 2 and I'm game.
I'm gonna wait till E3 2013 when the other systems from MS/Sony will be announced, and when Nintendo has new games to announced. Then it should be clear for which system I'm gonna settle. Probably Wii U anyway, because I can do all the other multiplatform gaming on my High-End PC.