Sign-ups open soon. CMP Community Based Gaming, (also known as Collaborative Multiplayer Gaming), serves campaigns from Europe:

Often the maps are modified from the Community Map Pack. Catch that? CMP using CMP. The map pack is kept up-to-date with revisions to existing maps as well as many new maps. There have been many improvements since the original release. It appears this Campaign will have many, if not all, new maps. It should be fun.

When there is a specific Sign-Up link, this post will be updated. For now, some information is at: