Be aware, there are many errors / non-existing API's etc. in this session. This is yet the worst session I've seen in this years WWDC. Sorry but I have to be honest.
Many errors / non-existing API's etc. in this session
May be those API (which were for beta iOS I guess) evolve rapidly and the session are no more up to date. But you could file a bug report at least to get a warning on the session presentation.