Apparently David Tennant is to quit after next year's run of specials. Or possibly - the reports I've read could be taken either way - after series 5 finishes shooting next year. But anyway, not much longer. Some sort of official release can, AIUI, be expected after 10:00pm tonight. I'll miss him. Although hopefully he'll have a bit more free time and might do some conventions and signings once he's left the show.