I agree it might be first only the Russian (2.5) and then maybe the Finns (2.55) due to the amount of work they have on the Russian content. I think mapping is a slow progress so they probably concentrate on the Soviet vs. German maps for first. The Soviet plus the German are already a big packet itself to be put together even without the Finns and the Poles.
And I remember Finland from FH1. Only one map and the Soviet controlled it most of the time, especially when they got tanks after Finland had the controlpoints and the only chance to get them out was panzerfaust that always didn't finish the job or occupy one of abandoned tanks on the battlefield. Sometimes the Soviet tanks reached the beach and yeah, wooden boats with MGs vs. Soviet armor + Soviet infantry in the line on the beach aiming at the Finnish troops advancing with their tiny boats.
One day when/if the Finns make it in the mod, I wish more content for them; maps, vehicles (armor, trucks) and weapons. Some part of the Finnish weaponry came from Soviet Union and Germany so in the end it's only matter of reskining, right? Then there's some weaponry by the Finns; Suomi SMG, Finnish variants of Mosin Nagant, L-35 and so on. The maps could more forest and village outskirt fighting in daylight, and some trenches. More solid ground for the tanks and less the river massacre.
I think that's pretty much everything I wanted to say for now.