concrete5 5.7.1 is a big update to 5.7. It brings back the marketplace and connect to the community features, which are now completely contained in a new Dashboard interface, as well as the sitemap flat view, which wasn't quite ready for 5.7. It also adds some UI improvements, like block type search in the add block panel, and some under-the-hood improvements like block-level caching. We've also added Twitter authentication and support for logging in with your concrete5.org community username and password to your own site!
Additionally, we've fixed numerous bugs, tightened up the editing interface, and made a number of under-the-hood improvements.
Full 5.7.1 Release Notes
Want to get up to speed? Check out all the things that are new with concrete5 version 7:
5.7.0 Release Notes