My prediction, which hopefully would be wrong. Here's the breakdown:
1) Quebec goes free, but a rump Canada could take its northern regions to create Ungava Province. Southern Quebec would be ripped off to create a land corridor to the Maritime Provinces.
2) Newfoundland would either become independent, or remain a part of rump Canada.
3) Northwestern Ontario would become a disputed territory between rump Canada and the Prairie Union, because in the last election northern Ontario voted Conservative, but southwestern Ontario remained Liberal.
4) Prairie Union could either consist of just Alberta, Saskatchewan, and Manitoba, or those three provinces plus the NWT and Nunavut. However, there is also a chance that Nunavut would join rump Canada.
5) BC and Yukon may or may not become one entity, but Vancouver Island and the Lower Mainland would become a separate entity on its own. Because all of BC would be cut off from the rest of Canada due to a potential separation of Alberta and Saskatchewan, they would either have to go at it alone, or they would be forced to make concessions to Alberta.
6) Alternatively, Wexit could become a reality and Western Canada as a whole becomes a unified entity, albeit it may also include the disputed territory in Ontario.
7) Secondly, there is also an option of forming a Maritime Union that consists of the Atlantic provinces, but they wouldn't be feasible in the long run, and would be forced to integrate within rump Canada.