I would love to see some WW1 Americans. My grandfather was First Sergeant in a machinegun company, and it has always frustrated me a bit that I can't find a decent AEF figure.
I would like to see far more variety of US, French and Soviet troops. Miniart has been a godsend to the Soviet figure modeler, but there is still a long way to go. We have German figures doing everything but changing their socks, but try finding a really good plastic set of US tankers or ANY French figures. The recent Tamiya French 1940 ones are awful. French armor is incredibly colorful but there are only a few resin figures to go with them, and now two DML guys.
Italians are also lacking, which is kind of odd considering how many fronts (and sides

) they fought on. It is nice to see DML offering a few Infantrymen, but how about a few tank crew sets, say, one for North Africa, one for Greece/Albania, one for Jugoslavia/USSR ?
As for non-WW2 subjects, it'd be great to see more modern US stuff and modern 'irregular' figures such as PLO troops, former Yugoslavian forces, Afghans, etc. I am looking for a modern Bradley crew and the only decent options are resin.