When a new remodelling of Spitfires and 109s were announced, there were some speculations on how the new roster would be. We had the G-2, G-6, and G-10 at that time, and there had been many opinions on the "ideal" roster representing mid-late war 109s.
One consistent opinion, seemingly gaining consensus among 109 fans, was that;
1) a "stop gap" G-14 should be introduced..
2) the "hypothetical" G-10, should be redesignated as a K-4, since by all means it really WAS a K-4..
3) a separate G-10 should be introduced
This way, we had the G-2 of 1942, G-6 of 1943, G-14 of 1944, a high-alt operations Gustav of 1944 in the form of G-10, and the final "superplane" K-4. I still view this as the most ideal form.
My guess on why the G-10 was left out, is that it was probably to shorten development time. Instead of modelling both new G-14 and G-10, I guess HTC decided to just add in a G-14 as a new plane, redesignate the old G-10 as a "K-4" and be done with the G-10.
As for now, one can only hope.