The #peertube project has a few test servers, but https://peertube2.cpy.re is updated every business day, 8pm CET with the latest developments. It's a good way to test things and spot bugs. ?
You can already see some of the changes that will be part of the next 2.1 release: https://github.com/Chocobozzz/PeerTube/blob/develop/CHANGELOG.md#v210-rc1