A French then Free French third campaign could be fine, i suppose it will be an american & a commonwealth ones (french material then american tanks & planes) An idea, not only because because I'm french , but the campaign will be with lot of variety. (France, Desert, Italy, amphibious invasion , Germany )
In few years add-on with civil war in spain could be fine (two sides pleeeeeeease not only the nationalists or the Condor Legion !), lot of varied INF but tanks & planes were here too...& the INF combat is interesting. And very varied scenarios are possible.
But I know...most of the time fascination around big and bad Tigers have préférence, what a pity
