@ djinn, Kreuzer
Nothing too out of ordinary you could expect from such war. But first of all the "basic" map idea would be set into the scenes of Taipale-Terenttilä region (having the russians cross the river and open fields with human waves) and you could all relate to your favorite Winter War movie. Basic finns sitting in trenches and russians throwing everything they have against them. Simple idea, difficult to get the russians running headlessly towards certain doom. Oh well, that happened in FinnWars too, I guess we could have it in FH2 aswell.
Second idea is to have the famous battle of Raate road with a twist. Russians are stuck in the middle of the thick forests on a very narrow road that twists and turns like a snake. Finns can maneuver within the forest and attack the russians from any direction. Whats the objective? Yes, theres an objective! Finns would have to destroy specific types of tanks in order to win. Imagine for example a T-26 which is either bogged down into snow, it has frozen over or its just stuck in the middle of other junk along the road... now, the turret is still in working conditions and it can still defend itself, but it cant run away from finnish infantry getting too close. So the russians have to protect these tanks, because if the finns manage to destroy them, then the finns will win. On other side of the map is another russian division who has working tanks and they try to race through the forest on that very same narrow road in order to provide much required defense against the white bandits who lurk in the snowy forest. Road would basically have several of these objective designed tanks sitting apart from each other so the russians have to divide the defense along the whole stretch.