I think they asked my husband to take Medical again, because they anticipate it will take longer than December 9 (MEd expiry date) to make a decision
If they have not asked you for Medical again, yes, probably is because they are just about to make a decision.
However, I phoned CIC yesterday, and the agent told me that my husband have to land in Canada, while his Medical is still valid...
So many scenarios that we can apply to our situations, that sometimes, I just don't want to think of it anymore