The Apparatus and Maintenance Shop will be moving there as well as Fire Headquarters, Fire Stores (as in equipment storage, not a retail outlet), and Health & Wellness. The saying that's going around the department is that a crew will have one stop to get all their stuff done - the truck will be in for a pump test or oil change or whatever at the same time as the crew can meet with chiefs, arrange for their gear to be cleaned/repaired, and get their physicals done.
It's going to be behind new #4, meaning west of it on the hill that overlooks Deerfoot from the Vista Heights side of the intersection.
I was by #35 recently and it looks closer to being finished than I'd been told. I'd heard it was going to be delayed by as much as a year, but the walls are up and styrofoamed, and look ready for the brick cladding - something that was put on #33 only a few weeks ago.
I would suspect the other hall(s) he will announce are 36 (8 St x 2 Av SW downtown), and maybe 37 (deep deep south, south of #30, toward the new hospital). I saw a document recently which I'll try to find again that has plans for halls all the way into the mid 40s.