I don't know. Most of their tracks will be GP style tracks not Ontario based point and shoot to the next corner. I'm thinking that the screaming twins will be better matched to the single thumper RC390. Too boot, as I read the rulebook the engines can't be modified. Reliability of the RC390 engine is an issue and the only way that the MA 390s are surviving is by changing engine parts to improve their reliability. If the engine must be unmodified from production, how will KTM deal with this?
As for the limits of the R3 suspension, the rules allow for it to be modified. There are already lots of options on the marketplace for the Ninja and R3 and the WSS class will only improve this. Several suspension companies are likely busy making new systems. Which is great for club racers since those same systems must be available on the marketplace for anyone according to the rules.