Edit: Adding real info for those who haven't heard about this before. This is Big Finish officially announcing their new Tenth Doctor Adventures line, with David Tennant and Catherine Tate.
Official announcement: http://www.doctorwhonews.net/2015/10/tenth-doctor-and-donna-team-up-for-big.html?m=1
Just adorable: https://www.youtube.com/watch?v=NtKUfubkQyQ
(Side note: Wow, DT is busy! He is constantly in new things, every week! It is so nice to see him doing so well.)