The program will take place in two phases. Phase 1 (61 ac) effectively specifies an off-the-shelf rotorcraft for IOC 2010/11. Phase 2 (71 ac for IOC ~ 2020) has a baseline KPP of 200kts and a target of 300kts.
The CV-22 would clearly offer a potentially common solution between the two phases but would be more expensive; moreover, I doubt the USAF would pick the type to meet its parallel CVLSP reqt (66ac).
I/C