We plan to release version 7.1 around next week, so this is really close: build 23892.
There are no major changes, just bug fixes and some polishing before the release. If you plan to upgrade to 7.1 when it will be released, it makes sense to try this EAP build to see how well it plays in your environment. In particular, if you plan to use the new feature branches support, make sure to try it out.
If you encounter any critical issues, please let us know the details via teamcity-feedback at jetbrains.com so that we still have chance to address it.
Please note that this build does not have EAP license key bundled already. You can get evaluation key on the official download page.