Does anybody knows when Framer will come for Windows to?
Nothing has been announced.
But look what i find in they own site which it says that Famer it support Windows to Framer supports multiple platforms – iOS, Android, MacOS, Windows or Web.
Framer works almost everywhere, it's just a JS library. Framer Studio IDE is Mac only
There is a job posting in their website for a Windows developer. So there may be plans for a version in the future
For now you can use it as a library http://www.prototypingwithframer.com/framer-on-windows-with-atom/