WWDC is really for application developers, but it's also a time that Apple has announced new products. I, for one, am hoping for some sort of home server.
What is missing from Apple's lineup, I think, is something to coordinate the music, data, apps, and pictures within a household. Wouldn't it be great if media could be easily and seamlessly grabbed off of a home Apple product that stored and synced things? No more updating apps, no more weird iTunes Match messages, no duplicate photos and separate libraries; there would be a solid place for the streaming media for the Apple TVs. What we need is a home library for our client machines. This product could be a ramped up iMac or Mac mini.
Also, if I'm right, I should get a free one.