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It's probably a piece commissioned by the in-house ad team.

The music for the 'reveal' video has been cleaned up by someone and posted on YouTube, not the same song but good nonetheless:

https://www.youtube.com/watch?v=tO_3JUsjleM

This site is pretty good for other songs Apple uses in their videos: http://applemusic.info

Sounds like Gwen Stefani music. I wonder if she helped write it. She was at the event sitting in the front row next to Jimmy Iovine.
 
Holy ****, I can't believe this is true (and it is! omfg)

I have no idea. But when I first heard that music I immediately thought of Gwen Stefani. I'm guessing she was at the event to fill Apple's celebrity quotient and because she's big buds with Jimmy Iovine.
 
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