IFMU,
Apparently, much of the S2, which Sikorsky is currently building, is an assemblage of components from various existing craft and outside companies. For instance, the blades are to be supplied by Emitt Wallace, the person who brought out the AirScooter
http://www.eagleaviationtech.com/airscooter.htm The S2 may be just a 'teaser' for government funding on the heavy lift contract.
I can envision a situation where Bell submits the V-44 quadrotor.
Then Sikorsky submits the S2 coaxial, and Bell chokes.
Then Boeing submits the interleaving configuration, and Sikorsky and Bell both choke.
Perhaps we will know a bit more next week after the AHS Vertical Lift Aircraft Design Conference.
http://www.vtol.org/vla06program.html