It's great to see that Fast Purge is in GA and active by default in all accounts! We at Milloh-CS have been leveraging it and helping our customers integrate the fast purge API calls in their CMS and publishing workflows for a while now and it is a great tool.
In the original anouncement (both in Edge 2016 an in the blog post) it was announced that it would have support for "tags", allowing more advanced use cases. The post says "early 2017", but I'd say that ship has left. Do we have a new estimate for the LA/GA of tags for Fast Purge?