FrostburnCove is still in design stages, but I can give you at least a few quick facts, because these have been finalized a while ago:
At its core, the map is set in cold and snowy Russia.
The map is between 25% to 33% the scale of Siege, which means the map is much more compact and with limited open space. It will most likely be the most dense map in APB Delta, and the effect of that will be limited vehicle maneuverability.
Roughly 1/3rd of the map is a Soviet R&D facility where MAD Tank technology was developed, and something else... The plot of the map is simple; Something went boom, and both factions have set up their base nearby to find out what happened.
You can expect prototype vehicles present in this map. At least one of these vehicles is not native to the Red Alert universe.
The map will feature small bases without base defenses. Aircraft is still something I'm undecided on; My focus is on good ground gameplay and great secondary objectives, and air vehicles may not necessarily add to this in a positive way.
Expect lava, including new effects for it.
That is all for now. I will not be posting as many updates as I did for Siege. I plan to keep most things a bit secret.