Possibly the best DX mod ever has been released... or at least part 1 has been released.
I've only had time to have a quick look at it, but it definitely seems impressive.
For it to run you need the latest multiplayer patch, which I've hosted, along with TCP setup,
here, or you can try the
official website which has four mirrors of the main setup file (but no DX patch... Afaik the only other place hosting the patch is Fileplanet, which -- as we all know -- sucks.)
Anyhow, please avoid posting spoilers on here (you can visit the official forums for that) but feel free to discuss any non-spoiler stuff about it here.