David Tennant's comments are at the start of the video and were filmed yesterday at San Diego Comic-Con.
David once again said about how excited he was about his Broadchurch co-star getting the role and that he had an inkling that it may happen. He also said that he knew in advance as she rang him just before the news was made public.
Apologies if the video does not play in your country.
Doctor Who section of DavidTennantOnTwitter.com