This thread has now been closed to direct all further updates about this release onto the latest announcement:
Release Blog post: https://releases.xamarin.com/alpha-preview-2-cycle-7/
This is a feature release. A few of the early preview features are:
Note that Alpha versions have not yet completed the full suite of tests by the Xamarin QA team. That said, customer bug reports are still much appreciated, even if the problem would eventually be caught by the remaining QA tests.
You can install this new Alpha version or switch back to the current Stable version by changing updater channels.
Release Blog post including estimated timeline to Stable: https://releases.xamarin.com/alpha-preview-2-cycle-7/
EDIT Feb 23: The Alpha previews of Xamarin.Mac and Xamarin.iOS have been temporarily unpublished pending some fixes to address essential usability. New versions should be available soon.
EDIT Feb 25: Some of the usability issues in the Xamarin.Mac and Xamarin.iOS previews have now been addressed. Additional updates on the way.
EDIT Feb 29: Add XamarinVS release notes.
EDIT Mar 03: Update Xamarin.Mac version number for new build.
EDIT Mar 07: Update Xamarin.Mac and Xamarin.iOS version number for new builds.
EDIT Mar 10: Update Xamarin Studio and XamarinVS version numbers for new builds.
EDIT Mar 15: Update version numbers for new builds.
EDIT Mar 30: Update Xamarin.iOS and GTK# version numbers for new builds.