Under the new Hub concept there is no home depot, and the Hub for Scotland is Junction 3A of the M8, which covers signing on points at Mossend and Millerhill Yards. So looks as if no depot based at Inverness, however will be interesting to see how any workings would be rostered as they are supposed to start and end at the same home Hub.
What I should add is that drivers will also be expected to lodge away from the Hub, so this may be what will happen if engineering trains need covered in Inverness. A driver from Glasgow will take a train up to Inverness, lodge overnight then bring the train back the following day.