Well to be honest, from pictures, the RDX doesn't look like a SUV... not sure what it stands for, but Acura calls it a CUV... the RDX doesn't look much higher, or much bigger, than a Forester... so they do seem to be competing against one another.
And I don't mind them going with a turbo for the RDX... finally Honda will have a 4-cylinder engine with lots of torque, and that should still consume less fuel than a V6 would have... my only worry is with the turbo reliability since Honda doesn't have much experience with turbos, but it's Honda... so not to many worries there...