Hah, I was wondering how this appeared in my Subscribed Threads.
Anyway, here is how to find the video:
If you have the WWDC app and you register your Apple ID for free developer credentials, you can see the "Platforms State of the Union" video. It is around the 44-45 minute mark if I remember correctly. You can also find these on iTunes and Apple's developer site.
There may also be footage in the Game Controller WWDC Session.
There is footage and they say the game's name, but I can't remember the exact name--it sounded generic.