Yes, it will need to stop for the reverse bit... Hoping we get a cool show scene during the stop, but luckily it still won't be like Gringotts where every scene is a stop.
I've heard a theory on what might be happening at that track switch stop, and if true, it has me extremely excited. I think someone even mentioned it already today in this thread actually.
If there is indeed a reverse, that would explain why they'd need to use both of the old stations. Back into station one for unload, then roll back forward to the other station from inside the building. If it has to back into the load station to unload, that would cut capacity.