We have released 7.0 beta 1! It is now available for download.
Release notes are here: https://docs.memsql.com/release-notes/latest/70-beta-1-release-notes/
The big feature that is available for the first time with this beta is fast synchronous replication which can improve synchronous replication speed on the order of 100x.
The MemSQL team would appreciate it if you would try the new synchronous replication and synchronous durability features in a test environment, and give us your feedback.