I went for a run around the airport yesterday. There appears to be something being built inside hangar 3 - the outside shell does looks far past it's best but maybe it was cheaper to put something inside it than knock it down?
From the images, I think the TVCA offices will be on the right hand side of the terminal as you face it from the car park - where the nightclub/cafe was. The Skybar looks to be part of this development.
As for BHD, Loganair would have known that the money was going to go away soon, which could explain the cut from 6 a week (Summer) to 4 a week (Winter) - although it is planned to go back to 5 a week next summer.