I'm mostly interested to see if Samsung's new AllCast Share with hub (is this supplied with the phone?) is any good. By the looks of the vids, it looks to me like it's trying to be Samsung's answer to Airplay. However, I noticed what looks like a huge flaw. It appeared to only mirror the phone screen. So in effect it's AirPlay Mirroring but not AirPlay for video / audio. You can't, for example, send a video to your TV via the phone and then close the video on the phone, do some other stuff, and still have the video streaming on the TV.
It also seems unlikely that Android apps could use this feature going forward, such as with the iPlayer etc, like with AirPlay as the tech is Samsung owned and not Android specific.
What worries me is that this sort of move by Samsung will seriously fragment Android further than it already is. You'll get Samsung specific apps supporting AllCast Sharing.