"Who was she? *has not read anything yet* I thought maybe his mother, but the way his eyes drift to Donna when Wilf asks later makes me think Susan, which would be the most exquisite piece of continuity. And who was the other Timelord to abstain?"

!!! My exact same thought, I thought it was Susan because of the way his attention then focuses on Wilf's granddaughter.

And is it just me or was that gauntlet on Rassilon's hand a Risen Mitten?