So will McGann be regenerating into John Hurt then, 'cos he won't be regenerating into Eccleston, that's for sure!
I'm puzzled why, at this late date, depicting McGann's regeneration into anyone (Atkinson, Grant, Eccleston, Hurt, whomever) matters.
What the guys at DWM
said years ago when they declined to do the regeneration at the end of "The Flood" is still valid -- a regeneration is a story of two halves, the build-up to the regeneration, and the aftermath of that regeneration. A minisode scene gives us the flashy effects, but it doesn't give us the story
. The only people with an emotional connection to Paul McGann's version of the Doctor to give the regeneration any meaning are the fans. And the minisode isn't going to give us a full "Castrovalva" or "The Christmas Invasion."
I'm not saying Moffat can't do this if he wishes. But I don't see the point
in doing it as a minisode. If it's just to check the box, it's pointless.