Huge fan of Redis here :-)

Its latest version adds the following:

• Access control lists (ACL) so that clients/users can be barred from performing dangerous operations
• Multithreaded I/O (Redis until now has been largely single threaded with async) which is bound to make Redis even faster
• Client side caching: this is really cool in my opinion, reminds me of the evergreen article about how StackOverflow does layered caching
• Longest common substring (LCS) command which works both on text and binary data

See Redis Labs: Diving Into Redis 6.0 and the official release notes.