I believe this is the relevant project:
https://github.com/neurocyte/ghc-android
Joey Hess has been using it to build git-annex for Android. http://git-annex.branchable.com/install/Android/
And much of the work we did simply improved support for cross-compilation in general, so Android support should be better than ever! : )
Would it be possible to drop a cross compiled Haskell library into a Xamarin project and call into it from the .Net (F#) world? That would be the killer feature for me!
Also not much mention of android here - is it possible to target android with Haskell at the moment?