I don't necessarily think it's the Christmas episode that'll reveal who the new Doctor is, but I do think they're waiting for a specific strategic time, whatever it may be. Could be they're waiting till the end of ALL the special eps. Tennant will be in all of those, right
The first season with the new Doctor will be airing some time in 2010, so filming will start probably May/June next year. That means that TPTB will have to have somebody cast within the next few months. I'm guessing that it'll be announced early next year. I'm also thinking that they wouldn't have allowed DT to announce he was leaving if they didn't already have a fair idea of who they were going to bring on to replace him.
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The first season with the new Doctor will be airing some time in 2010, so filming will start probably May/June next year. That means that TPTB will have to have somebody cast within the next few months. I'm guessing that it'll be announced early next year. I'm also thinking that they wouldn't have allowed DT to announce he was leaving if they didn't already have a fair idea of who they were going to bring on to replace him.