It says here
that Visual Studio 2015 preview enables cross platform development. And I know that VS is pretty damn good IDE when it comes to almost everything, so one can only hope that it'll be an adequate alternative for Eclipse\Android Studio. I use VS2012 for .net development and it has this IncrediBuild plugin that accelerates builds, and I read here
that it's available for cross-platform projects on the 2015 preview, I don't think other IDE's can keep up with that - it's really good.