I don't think there is one. My impression was they worked on that song specifically for the Omegathon unveiling. Your best bet is e-mailing Gabe or Tycho, and asking if there's a rip from the board of it.
It'll probably be on the DVD, which is your best bet. The music seemed like it was kind of an adaptation from one of the E3 trailers, too, which the music for is actually for sale in the iTMS.
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- H. P. Lovecraft