That is true. I have a Xamarin plan for use with Visual Studio for developing mobile apps in F#.
However I'm just keep running into stumbling blocks and general frustration developing in Windows, having switched from 10yrs of Linux purely for VS. With the general improvements in Mono and the open sourcing of F# I'd love to use them all together on Linux and take advantage of the greater OSS developer ecosystem there.
Monodevelop/Xamarin Studio is fine for development, more so with the newly-added split-view, and the F# support is pretty much on a par with VS these days, but without Xamarin.Android/iOS support I simply can't move.
Maybe I should suck it up and buy a Mac instead.