What is new in NR Rel17 evolution?

Hi Experts.
For NR what new in Rel17 evolution?
Till where it will go?
As of now Rel 15 difficult to catch…

I find discussion started for Rel18 as well…

Follow TR21.9xx series. xx stands for 14, 15, 16 ,17, 18.
3GPP started this document from release 14 I think to give overall summary of features in a specific release.
As release planning matures, document gets updated.