I know the last map, Ignus, was added not very long ago, but here is my suggestion for the style for a possible new map.
With Heartland we have desert zones and green fields with some hills and mountains. Ignus is an archipelago filled with islands and lots of water (yes, very technical analysis of the maps). A possible new and different style for the next map could be a SNOW BIOME.
Yes, I'm aware there is some snow on some mountains on Heartland, but with this map it would become the main feature and spread throught the whole map.
So basically, even more mountains & snow. Color palette would ofc be black/white.
**Some other cool features to possible add: **
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Small shallow rivers and frozen rivers in the maps that can be traversed only by some selected vehicles (so a special type of "road" where only vehicles with special tag can access and use as a shortcut/alternative, like tank tracks)
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More weather conditions (maybe not just for this map): Rain ("rainy cockpit ASMR you can fall asleep to" type shi), snow/blizzard.
Some pictures from the web to reference the style I'm looking for (mountains)

