It looks to me that Xamarin would like sunset Xamarin Studio. This was easy on Windows with Visual Studio, but on macOS I think they are waiting for the VS Code (or whatever it ends up being) to be mature enough.
OK, it seems like they have committed to Xamarin Studio renamed now to 'Visual Studio for Mac'. Doesn't make sense to me with the parallel effort building the cross platform IDE 'Visual Studio Code'. Thanks for the correction.
VSCode isn't really an IDE as much as a text editor and competitor to Sublime, Atom, etc. You can build in some languages with it, but it's not a competitor to a full-featured development environment like Intellij's IDEA or Visual Studio and not anywhere near a mobile development-oriented IDE.
In addition, VSCode is open source, so to some degree its direction depends on what the community wants to happen with it.
That being said, re-branding Xamarin Studio (which in my experience, has been buggy as all get-out) as Visual Studio Mac without many significant new features seems more of a PR move than anything else. It'd be awesome if they'd put more money/manpower towards fixing it.
Visual Studio Code versus Visual Studio for Mac can be seen as something like Sublime Text versus XCode. The confusing names aside, they both target slightly different niches.
