We'd been disappointed to find that iOS 4.2 only brought AirPlay video support to built-in Apple apps on the iPhone and iPad, but it looks like that's changing soon -- Apple just posted up the first iOS 4.3 beta, which allows devs to send video from apps or websites to an Apple TV. There's also a new beta of the Apple TV software for testing it out -- it doesn't have any version notes, so we don't know if it offers any additional features as well. One thing we're not seeing explicitly listed is any mention of mobile hotspot functionality -- and considering the Verizon iPhones we saw were running iOS 4.2.5, we've got a feeling everything still hasn't been merged up. We'll let you know if we find anything else -- stay tuned.
Update: What do you know -- personal hotspot is indeed in there, although it needs to be enabled on the carrier side to work. We're also told the iPad's gained some additional multitouch gestures, so it's quite a feature-party. We'll keep you updated as we learn more.
Update 2: Oh snap -- the iPad's side switch can now be set back to being an orientation lock! Praise be. Screenshot after the break.