The G-10 is gone because it is actually a K-4 as modeled and they are adding the K-4 true (I bet). I'd expect to see a K-14 to fill the gap between the G-6 and K-4. Frankly, I'd rather see the G-10 retuned to typical G-10 performance (425mph or so) and have the G-14 added as a gap filler between the G-6 and G-10 while capping it off with the K-4.
Like so:
Bf109E-4
Bf109F-4
Bf109G-2
Bf109G-6
Bf109G-14
Bf109G-10
Bf109K-4