Admittedly, I'd like to see more of what happened in the Time War on screen. It's a huge part of DW history that is basically unexplored, and this could be the means to do it.
OTOH, if Hurt does
turn out to be pre-Hartnell, it would greatly play up the 50th anniversary theme, by going back to the very beginning and finding out what made him steal the TARDIS and flee Gallifrey in the first place.
Either way, I'm on board for this ride. I haven't been this psyched about DW in a very long time.