With Patch 5.0 and the offical support of Custom Campaigns, I'm seeking to develop one. Unfortunately, I'm pretty bad at the Starcraft 2 Editor, beyond terraining stuff (having previously released a few melee maps under the name CowMarine). However, I have begun writing a SC2 custom campaign, and am seeking fellow lore-nerds to help bring it to life.
This campaign focuses on the fate of Broodmother Niadra, and the formation of the Zerg Compliance Ground-Force Unit, a Dominion Armed Forces unit established in the wake of the One-Day War in 2511. Operating out of the Phobos, a A Minotaur-class battlecruiser that took part in an operation to investigate the planet Gystt at the behest of Emperor Valerian Mengsk - an operation now known as the One-Day War.
This campaign would cover several planets and sixteen missions, be played from the perspective of the ZCGFU, and revolve around Broodmother Niadra as an antagonist. The ZCGFU would face off against the Niadra Brood and her Infested Terrans alongside the Daelaam Protoss and the Zerg Swarm under the leadership of Overqueen Zagara. I am still currently writing the story in full, though have plans to begin the campaign with a defence mission reminiscent of the Zero Hour mission in Wings of Liberty, and ending in a pseudo-melee match against the Niadra Brood, with Niadra herself on the battlefield (which I fully expect to be the most difficult mission to program, given both difficulty concerns and AI complexity.)
Along the way, the ZCGFU will unite with new and old Protoss heroes and Terran friends, and bring Niadra's reign of terror to an end.
I'm afraid I don't actually know how the teams function works, unfortunately - though I do intend to set one up once I'm confident the campaign has enough people behind it to make it possible. However, I'm glad you approve of my choice of villain.