I am gonna try write a little about what is new in new client versions. We also have change notes on the client releases but they are often no complete description and hard to read for outsiders. So maybe I'll try to write some text about new interesting changes. When I merge them in the corresponding topic of the upcoming release.
You can try the new features by either installing a Release candidate at the end of the development period or any time with a development set up. Read more here.