The third and possibly final release candidate of 2.1 is now available (build 2898).
This build comes with a couple of Windows-related updates: the Qt library has been upgraded, and the 32-bit Windows build now has a fully functional FluidSynth audio plugin. This has been available in the 64-bit build for a while.
Unless any showstoppers are discovered, the next build will be the stable 2.1.0.