They will be using the RJs on the same AF franchise routes (Paris-LCY, FLR, BHX, GOT, ZRH, etc) as they do with the BAe 146-200s/300s (17 of them if I recall), plus a SBY a/c and the remainder for network "expansion". Remember that as an AF franchise operator, they might take over some routes where AF (mainline) do not operate profitably and/or that do not justify anything bigger than a 99-seater - or a route where runway length justifies a STOL aircraft (FLR, LCY).
Cheers
