RM3 would be a non-sense (neither for me nor for Kawai I think.)
Although this is not necessarily unlikely. Remember, they came out last year with the CE220, which they outfitted with the AWA PRO II action, even though RM3 was well-established and in fact was about to be replaced with the GF action. I'm not sure if they are trying to burn through inventory or what, but it appears that Kawai is very comfortable putting out new products that use older actions.
My fear is that this will be a great product but for whatever reason Kawai America will decide not to sell it. Non-US customers have had access to several very interesting pianos---the CS9, for example, and CA13. The CA13 is a scary example because it's kind of along the same lines as this controller: a more basic version of more expensive products that nonetheless has what we are really going for: the good action. You can't get it in the US.
If the controller is announced at NAMM, I guess there's little chance it will not be available in the US, though. Right?
And as you point out, if the price difference between it and the top stage piano is very small, I will be extremely disappointed as well. When there are no good alternatives, we're always at the mercy of the people who decide what price these will be.