Where is a resource that shows new features/improvements of each GDS version?

The versions are coming out hot and heavy and improvements are happening all the time. At one point I remember seeing a doc that listed the new stuff of each version. Really useful in keeping things straight.
Thanks.

The best place to look is in our release notes -- either posted on the download center or on our github.

GitHub makes it easier to review the release notes for all the versions, whearas we tend to only link to the most recent versions on our download center.