As I already proposed in a topic, there could be a Shire mod. We now know for sure that there will be no Shire in the actual game. This is sadly disappointing because there was a huge battle in the book that had the hobbits fighting Saruman's followers and Saruman and Wormtail themselves. I know the movies did it a little differently, but that is no reason to not put it in the game.
I would like to start a mod that will at least add hobbit holes, building, ... I don't neccesarily think that the BFME modding community will be a TC one (at least not in the very beginning). TC mods of a large scale (RA2, TS,...) will probably appear a lot later (just like generals) Actually, I think there is going to be a Generals mod at some time, but the new game mechanism (preset building spaces, etc.) will make for a completely different experience.
Either way, modding will be most likely based around new addition such as factions or areas not present in the game. It would be really interesting to see the Grey Havens being invaded by Orc and the Valar coming to help LOL
Now that I thought of it, if there are no Valar in thea actual game, I guess they can be added in a similar way the generals were added in ZH. It woul make for a very diverse gameplay. You could have Morgoth for the forces of the dark, but only using the orcs, not the Skuruts.
There are so many battle and places in Middle-earth that aren't going to be in the game, that think the mods and maps for this game will be really interesting