Pixel and Tonic, the makers of Craft CMS has announced Craft 3 "Release Candidate"!
This means that they believe Craft 3 is ready for Production environments! It is now ready for new sites or for updating existing Craft version 2 websites.
There are a ton of new features, plus "Site Groups", a "Plugin Store" and introduces their new Craft License bringing it very close to Open Source.
Merry Christmas and Happy Holidays!