Here's pros and cons of each mod idea:
Coh cold war:
+would be quite a cool addition
- would take a very long time: coh is, as the team have said, difficult to mod
Wic reality mod
+fits in with soviet assault release
+easier to mod, all mod tools already released
- not such a popular game
Bf1943 eastern front
+planning and texturing now means mod can get a headstart before release
- no modding tools available at the moment, mod may take a long time