The move was intentional as San Jose is closer to Cupertino, where Apple is headquartered, than San Francisco. Mashable reports that there will be no change in attendance for the event due to the change in location.
What do we expect? iOS 11, watchOS 4, macOS 10.13 are the obvious updates. As of now, we do not have any leaks to base out assumptions on, so we really don’t know what is coming. The invite looks pretty though - and it doesn't reveal anything.
For more information on tickets and scholarship: https://developer.apple.com/wwdc/
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Image: Screenshot, Apple WWDC website