Well since I finally got the beta installed and registered properly the Prime now shows up as a Live etc like everyone said it would if it works. The folder it's part of has basic Cable channel box and a premium channel box and so far it does work on both though the premium part seems to have bitrate issues and a LOT of pixelization and dropouts.
The normal cable box seems to play much better though both also have no sound till I hit the options setting on the Aios and hit audio which then seems to jumpstart something and the AC3 audio works after that.
Just barely got everything working so may be some settings or issues on my end, plus I also noticed every channel is off and is actually about 5 channels higher then where the channel says it is.
I also have a WDTV live but it's not hooked up right now though I see that users report it also works so MAY try it later and see how it does but just thrilled it works at all for now.
I'll have to play around some more and see if anything changes as I try things but at least it's working even if it isn't perfect yet. I hope maybe they figure out how to make it a full blown media extender but not holding my breath for that one