We are in the process of planning and building our own persistent world for online play at Xenocorp. We will be waiting until after Hordes of the Underdark is released so we can plan for and test play the new epic levels as well as developing areas with the new tilesets. If you are interested in helping as a developer or just doing some play-testing for us, please reply.
Even if you just have a good idea for a quest or would like to help us develop our lore and cultures, feel free.