I wouldn't hold my breath. The one time Apple did stream the conference they announced it prior to the conference itself so people could prep. At the end of the day it may have just been a marketing gimmick to increase Safari usage or something. The stream was pretty solid, though.
Wish they would just stream these things live...not entirely sure what the benefit is in not doing it.
...then again, I don't know what the benefit is in doing it for them, either...
I just know I want it, and it more than likely won't happen.
I thought it was to test out the streaming capabilities with the (then) newly launched QuickTime X