I think the progression of the engine looks like this:
WEGO1: Desert War 1940-42
WEGO2: Stalingrad: Nightmare on the Volga. Introduces bridging and pontoons, ski troops, partisans, security units, supply depots, airfields, and air transport of supplies.
WEGO3: Monty's Front: 21st Army Group. Will introduce airborne and riverine operations.
WEGO4: Title TBD...introduces expanded naval rules (amphibious operations, naval interdiction, counter-naval operations, naval supplies, etc.) Best topics for exploring WEGO4 are Narvik, Seelowe, Sicily/Salerno/Anzio or Normandy/Avalanche.
WEGO5: Title TBD...World War II in Europe and the Mediterranean. I think WEGO5 is the "Operational Art of War" version of the WEGO engine. It is an amalgamation of all the terrain types, unit types, and asset types found in our "previous games" plus those missing. It would add new nations/factional units and assets...AND provide a scenario editor that includes catalogs of units and assets of for all WWII Western Europe/Mediterranean Theaters from 1939-1945...from the Invasion of Poland to the Fall of Berlin. It would also include a list of new scenarios and campaigns that explore the various aspects of these theaters. Maybe a sandbox mod at this point. WEGO5 is a game and a robust toolkit for would-be scenario designers.
Bottomline: I think expanding the capabilities of the WEGO engine takes precedence over topic. The topic chosen best supports the next set of capabilities. In the end there is a well-stocked toolkit of art resources and editors so that fans can explore their interests on the Western Fronts and easily share their scenarios with others.
I have invested in research/resources to support this progression...but what do you say? What should WEGO4 and WEGO5 introduce to the system? What should the topic of each be about?
Sell it to our readers.
I like the idea of a future game with airborne units.
Possibly Operation Anvil for WEGO4, with maybe some what ifs for Axis reinforcements, an extra panzer division. I think the Axis counter attacked with a panzer division, which could be tense. There seems to be more room to move in that region.
Anzio and Salerno are good one for naval operations. The allied forces almost lost both of those operations.