Not sure if it's me, but Steve is talking really slowly, pausing a lot and looks like he's momentarily forgetting parts of his speech (he probably has teleprompters but that's what it looks like), like when he's summaring/listing the features of the iPad, he almost stops before saying 'Facetime camera'.
Oh, please! The only reason you're saying that it because of his medical leave. That happens every single Apple keynote...nothing unusual. I'm positive that you forget things too, especially if you're speaking in front of hundreds of people.