I'm really wondering how they're going to fill out an entire half hour special on the Eighth Doctor. Sure they could get into the audios, but that's not exactly visual.
I do think the half-hour special could include a look at how Who
endured in both print & audio during his time. But I think most of it will be commentary on the movie itself (both in front & behind the camera) as well as how fans received the Doctor as suddenly a romantic figure, IMO.