I've been reading about what they are planning to do with XCOM 2 and modding, and it sounds extremely exciting. Not only are they planning to release an XCOM modbuddy, but they are going to release the gameplay DLL source, like for civ 4 and 5, AND the Unreal editor they use internally to develop new assets, AND 50 GB or so of their own development assets. This is really more support for modding than I've seen for any game in a long while.
Yep, even if its crap the community will make it great. Although i think it should be pretty decent in its own right. I know there are quite a number of scripted maps. And the editors allow you to create your own. My only worry is that the geoscape strategy will be a little lite. But we shall see.