I'm intrigued by the 2018 but I really don't care about the transmission, DCT or 6 speed, I'm content with my 5 speed 2013 F6B.
The things I am intrigued by are ride by wire, reduced weight, and the improved front suspension. I have a 2013 FJR and a 2013 F6B. The throttle control on the FJR is much, much better than on my 2013 F6B, which is what makes me so interested in ride-by-wire. When I'm riding 2-up on narrow streets with stop-and-go and hills involved, the F6B doesn't compare to the throttle control of the FJR. Also, I think the FJR suspension handles bumpy roads much better than the F6B.
If forced to keep only one of my bikes I'd keep the F6B over the FJR. My main complaints with my F6B seem to be addressed with the 2018 Gold Wing (on paper only, haven't ridden one yet).
I do prefer the sound (or lack of sound) of my F6B compared to my FJR.
I guess it depends on what you are seeking out of the new wing. I'm still intrigued (unfortunately, I don't want to be).