Well there was me just checking Outpost Gallifrey before turning in to find David Tennant will be leaving at the end of next year.
My initial thoughts are that I will do my usual thing. Not be too sure about the replacement for an episode before then deciding their the best actor to ever play the Doctor. I have no loyalty that way! I genuinely thought that Christopher Eccelston couldn't be bettered until about half way through New Earth when I decided David was the best Doctor ever!
My second thought is that Marc Warren has to be the best choice for 11 out of all of the previous rumours. I hope they can keep the details of the new person quiet for a while longer (ie at least until next year) as they could end up being old news before a minute of their first episode is broadcast.
Anyway, Time will tell (it always does).