Epic Games started to openly develop the next Unreal Tournament on Unreal Engine 4 with the community. When they are done they are going to have a market place where modders can submit content for distribution. We are waiting for this to happen and will start working on an XMP related mod once the time comes 🙂
Here are some links if you are interested:
http://www.unrealtournament.com/blog/

Regards, Saiboat
Can’t wait! Really enjoyed utxmp, look forward to its return.