I would really like to see a second expansion for the eastern front as this front is so large. I really want to see some of the earlier tanks introduced so that early scenarios have the proper equipment, Like to see the panzer II & III (although the Panzer III was with DotF) , the T-26 & BT-5 tanks for the russians, also the lighter AT guns that were around Pak38 (this can be used on all the fronts) the ZIS-2. more snow boards with more woods, built up areas, more streams and frozen lakes.
I would love to one day see a Winter war expansion (the finnish soviet conflict, introducing the finns as an army) I find this war very interesting and there are so many great scenarios to be had. Anyway I think this would be a long way off yet as the pacific has not come to the table yet.
Im sure there are other things people would like to see in a second eastern front set aswell.