That was the first time David Tennant had attended a Comic Con.
One of the questions for David was if he processed that he was not going back and wear the Tenth Doctor suit again ever, or at least for a long while (as he was leaving Doctor Who after five years).
David reply was: 'I don't really know. It's funny, when we finished there was a chance that I was, wasn't there? We were going to go a little extra thing which has unfortunately fallen through. So I always had that. And now that's not happening. But I don't know. Not necessarily an articulate answer, is it?
Link to read the full interview