Assuming that release of the Combat Leader game can´t be that terribly far away anymore, I would prefer to see reserved any eastfront stuff/Mega Cam for this game instead! Another eastfront Mega Cam (beside Lost Victories for SPWAW) can IMHO only be topped with the superior Combat Leader game system, OOBs and graphics!
That said, my vote clearly goes to a "western front" or "southern front" (italy) Mega Cam, preferably played by a human Brit or Canadian player against AI germans (high time for Brits/Canucks with 2 Mega Cams already played by human german player and 2 by US!). Not to forget, to get the most out of human vs. AI played games, the AI should "play" the mostly defending side due to its lack of clever assault tactics. From scenario makers POV, it´s quite challenging to "script" an attacking AIP, but letting the AI completely go on its own usually results in dumb "early soviet union" like mass assaults.:( That seldomly fits german assault tactics and not at all US or CW ones.
Not regarding Combat Leader, I also would vote for a russian side Mega Cam, preferably late war, where germans are generally more on the defense. I´d like to see more desperately defending german infantry with rare armored counterattacks, very few Tigers and SS, some sort of payback for Barbarossa in 1941 (Lost Victories) and reversed conditions! ....and hopefully some russian scenario makers in the team this time!:)
Another nice idea for a Mega Cam would be to follow the german paratrooper branch through the war years, starting from attack on the low countries in 1940 (Eben Emael, Holland,...), Norway, Crete, then the ground operations in russia, north africa, italy and finally western europe in 1944/45! That would be the "perfect" counterpart for "Mega Campaign: Screaming Eagles";...."Mega Campaign: Green Devils"!
Or what about another "specialized" branch of the armored (german) forces? Following the path of a Tiger unit would be cool, but I´d rather find it much more interesting and challenging to follow the path of a much more common AFV unit like "Sturmgeschutz" (assault gun) or "Panzerjager" (tank hunter)! Same goes for other nations more specialized units. How many tank destroyer batallions had the US f.e?
Aargh...too many ideas..and probably none of them will see the light..at least not that soon. I guess some "Mainstream" factor will play a large role as well, as we yet speak of a product that needs to sell!