Just stressing the possibilities David and also stressing that no announcement at which side of the route the aircraft will be based.
Surely it's just better to just wait the 2 days until the flights go on sale before worrying about how it is to be crewed etc.
I'm sure however those that are already employed by the airline will have the opportunity to re-locate before any new posts are announced. Without knowing where the Fokker 50s are based as i'm assuming that the cabin crews are not both RJ85 & Fokker 50 rated.