If it goes to 700cc then it lets the MT-07 in. I see they already race them in the Twins series as part of Moto America. The potential issue is that the Aprilia has about 25bhp more than anything else in that capacity out of the crate so it may still be a sort of one make class. That said, I'd bet that the other manufacturers are watching the RS660 very closely - especially the positive launch reviews. 650 Panigale anyone?