As you may know, I have been dealing with activation issues at EF quite extensively, and the new digital entiltlement has me in a tizz as well.
As we know OEM vs Retail refers more to support channels than transferability. The confusion is when OEM licences gets converted to digital entitlement (and Retail per se) - does it mean the OEM's relinquishes maintenance responsibilities?
My understanding is that the upgraded key maintains it's rights - thus the OEM key for Win7/8 will always be the respnsibility of the OEM - however as soon as that becomes retail via digital entitelment, MS assumes support.
In other words, transferability is maintained by the underlying key not by digital entitelment.
Sorry, if I sound like I'm rambling, just trying to makes sense of all this...