Nope. Not gonna happen. Chris won't do conventions, won't sign Doctor Who items and he declined to participate in the 50th anniversary even after Moffat diplomatically tried to talk him into doing it. He wants to distance himself as far away from his association with Doctor Who and the fans as possible. He maintains a professional candor when speaking about his involvement with Doctor Who in interviews but behind the scenes there was a lot of bad blood and that's why he announced he was quitting before the first season had even aired. I understand it's his choice and his prerogative but it's kind of a callous attitude and I have no respect for that.
Eh, he's just a professional actor who doesn't like to dwell too much on his past work and would rather focus on new things (much like Harrison Ford). He may have had some issues with certain people during his time on the show, but as those people are likely all gone by now I seriously doubt that's his reason for not wanting to be involved with DW anymore.