Good point. Somehow it didn't stick with me that it was used before. But, I think the tone is very different in this context. It's hard to pin it down, but the way he used it previously seemed less reflective and more promotional. Of course, the re-use could just be incidental, but I think its re-use may give it even more weight.
He did the same thing last year at the original iPad launch, with same phrase (here's the top hit in google I could find for a picture of the slide):
http://submittedforyourperusal.com/2010/02/10/the-intersecti...