So here's something interesting, if you're curious to know what features might be in iPhone OS 3.1. It seems YouTube is chock full of videos shot in what seems to be defiance of Apple's NDA for 3.1 features. A couple of gems hint at expanded copy/paste functions, and there's one video which we could swear might hint at a real-time zoom... perhaps not just for photos but for framing video?
Anyway, it's a bit of a mining expedition, as searching for specific [REDACTED] methods or properties yields best results, so don't get all hot and bothered thinking you'll peep an iPad by searching for "setAppleTabletSize" or something. In fact, all of these could be fake, although the sheer number of videos seems to suggest something other than a grand deception.