Wow, I really didn't expect that at all. I thought he had already signed on for Series 8. While I never really felt attached to him as I did David Tennant's Doctor, he was pretty good and did grow on me (particular this past season).
I take it that the Christmas episode will be the regeneration episode then? I wonder when we'll find out who the Twelfth Doctor will be.
Yes, the implication is a Christmas regeneration.
Didn't expect this, but his tenure is above average for a Doctor:
* Hartnell did just under three years before leaving due to health problems.
* Troughton chose to do only three.
* Pertwee left after five following the departure of Katy Manning, the death of Roger Delgado and a refusal of a pay increase
* Tom Baker felt he'd done everything after seven and the producers were getting a bit tired of him
* Davison took Troughton's advice to do three only.
* Colin Baker was basically sacked by the BBC.
* McCoy probably would have gone after four years had the show not been cancelled after his third season.
* Eccleston did one season.
* Tennant chose to go after four years.