The article is dated March 16th, so seems they have slipped this awesome news by us on the back channel. The news is also listed on the Office 365 Roadmap as launched.
If you have waited on this before recommending usage of Groups, now there is no stopping you.
You cand find the support article at:
https://support.office.com/en-us/article/Restore-a-deleted-Office-365-Group-b7c66b59-657a-4e1a-8aa0-8163b1f4eb54