On a separate note, I posted 2 games to the Windows 8 app store last week. This last week or so has been going through their developer security checks and I finally got approved yesterday. Both apps have started the certification process. They passed the first 3 steps (Pre-Processing, Security Tests and Technical Compliance) now just waiting for Content Compliance. It states it could take 7 days, but I am hoping it gets pushed through faster since Win 8 launches in 2 days.
If they get approved, I will let you know if they appear on the App Store on the Xbox as well. I'm kind of curious how that will work as there isn't a specific option for Xbox Apps when compiling and submitting to the store.