I can guarantee you that people are working on it. I don't know the specifics, but it's coming along. You can follow the commits here [1]. Of course because it is free software, if you are not afraid to test a early prototype, you can get a build for every push to the repo. It is a bit complicated (lots of clicks in our custom CI interface), tell me if you are interested.
[1]: http://hg.mozilla.org/projects/elm/, the elm branch being the repo where people work on Win8 support.