BBC Wales Today this evening featured a report on the press launch including a brief interview exchange with David Tennant and Billie Piper, along with short clips of the next new episode, "New Earth," which launches the second series on April 15. Below are screencaps from the report; click on each for a larger version. (The last image in the set is aspoiler, so don't click that one if you want to be surprised.) (Thanks to Leighton Calvert)
UPDATE: The BBC Wales Today report can currently be viewed with RealPlayer, at this location.