It's also possible that the extremely negative reaction to the length of 60 minutes got them to reconsider. Let's hope that 90 minutes is correct! Mr Awe
I'd be slightly suprised if there weren't any appearances by classic doctors. Not that I have any personal attachment to the old stuff, it just seems appropriate for such a milestone. Maybe they're keeping that for a surprise and hoping this "lesser" reveal keeps us busy for a while.