Although these provincial documents are not multigrade, per se, they do address the learning outcomes for French 5-12 in a rather succinct format. As a non-french speaking teacher who has had to teach multigrade french, I have found these two resources helpful.
Implementation Information for Teachers of Core French 5 to 12 (PDF, 160KB)
Core French 5 to 12 Enhancement Package (2004) (PDF, 320KB)
Teachez-vous francais? (below) is an article explaning how I approached french language teaching in a multigrade context. (It’s coming! I have yet to find my file!)
Multigrade Teacher 