Here are my thoughts as you asked for discussion and how it could impact future designs. So, I'm taking this stuff seriously!
I like the concept but I think you will get more mileage if you include three mapboards that can meet in the middle, all with each other. This will give you much more flexibilty. Currently with boards A and B you have one option:
A - B
If you had three DW boards (A, B, C) that could all meet in the middle your options would be:
A - B
A - C
B - C
The cost of one more board triples your options. Someone mentioned two hills like High Ground, but you could have:
A = One level 3 Hill sloping to a small village (connected at the village)
B = Two level 3 Hills sloping to a small village
C = One level 2 (or 4) Hill sloping to a sparse village
Obviously the choices are endless.
Beautiful counters, but I'm looking for more as we've got Aircraft counters from numerous sources already. The Swedish pack, your Japanese paratroopers and Thai units raised the bar on the possibilities that you can give us.
* Russian Guard units - dark red, instead of the black of the SS.
* Marines - marine blue (or whatever they call the color of their dress pants)
* Sissi - darkest grey
* Ghurka - dark brown
My point is I threw away my blue German SS, because I like how the black SS look on the board, especially when they're mixed with regular German units. Dark red Russian Guards units or blue Marine units with accompanying scenarios would look extremely cool on an ASL board. No one else has tried it and it would set BFP apart. Look how valuable and collectable A Bridge Too Far and the HoB SS #1 and #2 packs have become just because of those darn black SS countersheets.
This depends on how far MMP takes the clear overlays.