Major Nelson E3 countdown
I don't know if it's common for Major Nelson to place a countdown on his blog to the E3, but he did this year. Ofcourse we can't be a 100% sure, but this is another hint that Microsoft will introduce the next Xbox at E3.
I can't wait to be honest, I've got the X360 since release date, I received a new one 3 times, but still love it. :)