A new article from appleinsider indicates iPad/iPhone airplay mirroring will be compatible with IOS games. So this means you can view angry birds, or other iOS games on your HDTV. You can also view videos and other things through AirPlay as well (with an apple tv of course) read the full article to get the low down
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Source:
AppleInsider: IOS 5 AirPlay Mirroring will be it's "most exciting feature"

Source:
AppleInsider: IOS 5 AirPlay Mirroring will be it's "most exciting feature"