Quote: for example for me PzC serie with no Berlin title is like leave serie with no end... some east titles are needed to cover early war (south and north front) maybe something in Poland (where play with soviets+germans in same side and maybe an early war between them in a what if)
The Germans would need some serious artificial balancing help to make a Berlin title interesting. Aside from being the climactic battle of the war in Europe, it was a one-sided operation from the start. The Germans were weak and very limited defenses were in place in Berlin itself.
East Prussia '44-45 could be interesting as there's enough to do and the forces are less unevenly matched, and the EP '14 map could be used as a base with some modifications for new rail lines/roads and changes to the terrain
Fall Weiss typically doesn't attract much attention from US developers, I'm not sure why. Maybe because it's less well known than the war in France?
Northern and Eastern Europe featured relatively few forces covering a lot of terrain, a huge map also brings balancing problems with it.
In terms of which campaigns are truly still missing, I miss mostly Fall Weiss and operations in the Ukraine west of the Dnepr in 1943-1944. The latter could, if it has a big enough map, also cover operations in June 1941 as a bonus campaign (or the other way around, of course). That would be a big title and a nice end of the series in my opinion. The map would need to be huge if it would need to cover all the fighting in the Ukraine up to the Dnepr, but covering the area from the 1941 border to Cherkassy or so to the Dnepr between the Pripyat Marshes and Uman would make the map comparable to Moscow '42 in size.
The summer phase of Fall Blau is also missing, but it's more or less impossible to cover in a single title due to the front extending towards the Caucasus.