I wonder what (if any) ramifications there'll be from Victoria's exiling the Doctor. (It doesn't seem to have had much effect in "The Talons of Weng-Chiang" or all that time the third Doctor spent bouncing around ol' Blighty with Brigadier Lethbridge-Stewart.)
I do know that Torchwood features again; heck, I know they're doing a whole spinoff series about it with Captain Jack due to be a regular, although if it was me I'd tell 'em not to bother. Does Britain really need another time-traveling eccentric and secret quasi-governmental agency dealing with menaces from time and space? You've got the Doctor, you've got UNIT, anything more is superfluous.