Being bereft of my PC meant that I couldn't post this sooner:
The first Eccleston-less appearance of David Tennant is going to be tonight at about
9pm GMT, as part of the BBC's annual
Children in Need telethon.
For anyone who can't wait for the subsequent streaming at the BBC web site, the link to BBC1's online simulcast is still on one of the Dragon*Con mailing lists somewhere (since everyone's likely to know who I mean: I think it was Rob who posted it originally...). Just use the link I added to the time to synchronise your own time zone, and have fun!