There didn't seem to be any development going on that I could see. Watch the footage - there's plenty of room to expand the away area. All the seating areas in the lower reaches of the stands were empty and covered in canvas adverts. They could have given us the whole stand if they'd wanted to.
This is not the first time this season I've heard 'away capacity reduced due to development'. Getting to be a bit of a cop-out, I reckon.