<humor> What Apple neglected to mention is that they've moved WWDC to a small 15-person conference room on the Apple campus. </humor>
That is quite impressive. I wonder what percentage are new-to-Apple developers because of the iPhone, what percentage are long-time Mac developers who have never gone to a WWDC before, and what percentage are really non-developers willing to pay the large fee just to see the keynote?
Oh, and just to clarify...
Apple will likely release a video of the keynote presentation for free on iTunes as a 'podcast', as they have done with previous keynote presentations.
But the "video sessions" that are being referred to are the in-depth sessions designed for developers. The content of these sessions is covered by NDA, so these sessions will *NOT* be made public. Registered developers who have signed an NDA are allowed to purchase copies of these video sessions from the iTunes Store. (I believe they did this last year, too.) The sessions are small(er) presentations (usually) by programmers at Apple, not any of the 'big names', and are highly technical in nature. Basically, think of them like college lectures.