I was thinking about this and don't have an answer, so ill ask.

Registration codes are not system specific. So if someone plays on PC they could technically order the Xbox ultimate collectors edition, and use that SoA code for their account. Thus they could access SoA content on PC (after the version update info)

If that is true, other then the registration code, what does the PC Digital Download contain? It cant rly be the content itself since its not done being developed yet.