Yesterday I decided I'd just get on and renew my iOS Developer account. After downloading Yosemite (which is pretty awesome by the way), I downloaded Xcode 6 so I could play around with Swift - the main reason I renewed for.
I created my first Swift playground and noticed that
UIKit is immediately imported... My first thought was ooh, so I can play with UI in the playground?
In short: it doesn't look like it.
That's a shame.