Like I said before, DSL 2.1 will have at the most one new team of replicas and one new team of AW's/BW's. The primary function of the patch will be to fix bugs and improve what's already there.
Next on the arena list is the Drag Strip mk.II, which will take a while to make. I've always thought a replica of the MMER arena or the Mechwars arena would be cool though, so maybe after that...