Necno (the original singular and main dev) is working on a new project (Birthright) in what free time he has, and is no longer working on WM.
Docclox is on hiatus though he's said that he eventually plans to come back and finish up some things.
I've also been very very busy with other things and had gotten tired of working on WM. However, if I eventually have free time for it and the itch to work on it, which is fairly likely, I may do some further work on the project at some point. So... on hiatus as well.
I can't really speak for the remaining devs (WonderDog, delta224, anondb, Mirroar, myrikhan), but it's been a while since we've heard from one of them.
So... currently, nobody is working on it.