Another thought.

If I where Graviteam I probably would not make a game solely focused on early 1944 or later. With each installment the game timeline moves back. We started with mid 42 with Kharkov 1942. Then Gravi did GTOS's predecessor Kharkov 43 which you guessed it, focused on early 1943. GTOS focused on late 42 to spring 43 with a few DLC's focusing on summer 42. Mius is going to be summer 43. This one is the turning point of the war in the east. Not sure if another stand alone game after it would be worth it. Maybe best to just make DLC's for Mius that expand out to winter/spring 1944 and then move on to other fronts/wars. Because in theory it would be cool sauce to fight in summer 1944. But reality is that a whole game of your battalion of panther tanks getting hit with 6 battalions of T34's and IS tanks might actually get stale. As a large expansion. Yes.. an entire game. Not so sure.