Take a look:
Installing Xamarin for Visual Studio 2015 Preview[
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As a testament of our close collaboration with Microsoft, we shipped same-day support for Android Native C++ projects in VS 2015, as well as deep integration with Microsoft’s Hyper-V based Android Emulator.
The experience basically is that now in VS 2015 you have two new templates for Android and iOS.
Launching any of those two templates will create a project that is like an introduction to the product and links to download it (similar to what the Azure templates do when you don’t have Azure SDK installed).
Now you can just click that download button, and get the new integration for 2015!
If you happened to have a previous version of Xamarin for Visual Studio installed, please keep reading as you may not have gotten the 2015 bits installed by default (it’s something we’re fixing shortly).