Yeah it would. I had a feeling in Journey's End that that would be the last 10th Doctor/Rose that we would see but I didn't think it would be the last episode within a series that David Tennant did. Yeah I assume they will be an hour each but obviously the longer the better. And what I want to know is is the Christmas one counted as one of the four specials, because it wouldn't be 2009 then. In the article I read earlier it sounded like one of the specials was going to be aired at the start of 2010 too.
I read that they're thinking that John Simm (The Master) or someone that's in the 2008 Christmas Special could be the next Doctor. That's just ridiculous!