This is the entire audio from the Xbox briefing held today in Tokyo, Japan.
With the exception of Peter Moore, the entire presentation is in Japanese.
Peter Moore's section starts at 24:33 and ends at 42:41
I won't be able to get this on to iTunes until later today…so download it manually from here for now.
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1:35:09, 15.2 Mb, MP3
At the very least, listen to the DO DO DO song at the end!