Oliver Drobnik at Cocoanetics has beautifully zaprudered this year's WWDC banner, finding app icons from Path, Star Walk, Instagram, Foursquare, and more (by "more" I mean exhaustively more).
He notes that social networks have a place of prominence, as do maps and productivity with a strong emphasis on iOS. I love this sort of fun analysis. If you do too, go read the whole thing. If not, look, squirrel!