This is probably the most stable release ever, even more than the 2.x branch; nevertheless the 3.x is still going to evolve much yet, reason why it's still not recommended in production.
The cache backend has been almost fully rewritten, thanks to all testers and contributors, and unit tests proven to be useful and have been heavily extended to numerous edge cases and various non regression testing.
The cache backend should now be ready for sharded environment usage, using twemproxy or any other sharding proxy, although it's still lack testing at this time.
Last updated: May 5, 2015 - 12:18
Official release from tag: