Well, you have probably read as much on this forum as I have but the way I have seen it, file transfers are done for few reasons; 1. previous sponsorship, 2. genuineness of relationship, 3. status has ran out, 4. backlog in Vegreville, 5. Refugee status denial or some other type of status or status extension denial then spousal sponsorship application, 6. An issue related to the Sponsor's identity that needs clarification, 7. An issue related to the applicant that needs clarification.
Do you mind me asking you what your spouse's Country of Birth is and what their status is here or what it was when they came here?
My husband came here for an extended visit in January as it was expected that I would have shoulder surgery. We ended up getting married in February and then we extended his visitor status which was given to him for a year. I had my surgery in late June. I have a feeling they won't rush the application because his status is good until July of 2013. I have seen applicants with file transfers whose status has ran out get an interview within weeks.