It's just a normal part of the process. Once they've approved the sponsor and requested the biometrics and medical, they transfer you to a visa office. Once it's there, they'll review the evidence you submitted to prove your relationship is genuine. You might get a request for additional documents if they're unsure of anything, but otherwise the next thing you will hear is the request for passport if they approve everything
I got transferred to Mississauga on Friday, so let's hope we don't have to wait too long to hear back!