This is probably the last EAP build before the 9.1 release planned for the next week.
Comparing to the previous one, it has SBT runner plugin bundled and it defaults to not using server-to-agent HTTP connection anymore (details). The build has an RC quality and is recommended for the test servers.
It's your last chance to try pre-release TeamCity 9.1 and notify us if anything goes wrong with it!
The build already have no EAP license key bundled, so let us know if the server switches to professional mode on upgrade.
Stay tuned for the release!