The Delta Engine v0.9.1 release has just been uploaded. Check it out for tons of fixes and improvements. Details will be available shortly on http://DeltaEngine.net/Wiki.Roadmap
v0.9.1 allows building for Windows, iOS, Android and WP7, but you will need a Marketplace license, which is not publicly available yet. More information on that at http://DeltaEngine.net/Marketplace
We are also starting nightly releases now to keep you in the loop and for shorter turnarounds on bugs and features. Monthly stable releases are still coming, but you now always have the chance to check out the latest developments.