Going by the Windows 8 surface tablets and Phone events I am hoping a MS manned Xbox event could still be on the cards before the year is out with an announcement of the New Console. At E3 you would have goes on the new games coming o the console with this years event being only the announcement.
MS new approach to these things and the fail on Nintendo's part on how they have handled announcing the WIi U - I think that would be a good move.
Shifting games, delayed games, games that can not work on current consoles being shown off, price cut of the 360, sales finally slowing down..
I think this is on the cards.