Today Apple announced that they are moving Worldwide Developer Conference back to San Jose. The move puts WWDC much closer to Apple's campus and makes it a lot easier on Apple engineers attending and participating. San Jose hotels are also a lot less expensive than San Francisco hotels and will save attendees significant amounts of money.
There are already questions in the community as to whether moving to San Jose will put a damper on the more social aspects of WWDC. Despite the fact that San Jose is a lot sleepier than San Francisco, I don't think there will be a problem. I tried a case in San Jose a few years ago and spent several weeks in the city. There are nice restaurants and things to do. Moreover, I've always felt that the energy at WWDC parties comes from the confluence of Apple nerds way more than anything particular to San Francisco. I hope to see you there.