Looking at it I doubt the concept one has an airbag in the design so i guess the one that makes the final RS model will be quite different.
A smaller steering wheel is the one thing i would love on the trophy, its just slightly too big. Another inch of the radius of it would have been perfect i think.
The airbag housing on newer cars seems to be getting smaller, so hopefully it will allow the new RS to have a smaller wheel. (And hopefully it will be interchangeable to a Trophy although i doubt it).