The CEW should be designed quickly, if the Moon is the next goal.
However, I doubt very much a CEW on top of a Delta 4 or an Atlas 5 can land a crew on the Moon.
Maybe on top of a Shuttle C or Energya, but not smaller.
Now, if it's an Earth Orbit Rendez-Vous, then perhaps the Delta 4 is ok, but another rocket will be needed too.

BTW, a great way to start training for a Mars flight is to have the current ISS crew stay at least 6 more months than planned, up there.

I wonder what the International ISS partners will think about this. Especially Italy which has so much invested towards the ISS.

Raoul