They're finally released it!
https://www.simplemachines.org/community/index.php?topic=564881.0
Good deal, time to update our installs?
Well, that's personal choice. I haven't decided if I'll do it yet or not. There's still probably bugs and I'd probably wait a week or so to make sure there's nothing major someone found that was missed. Also, your mods and themes may or may not work.
I plan to setup a test site to test an upgrade to see how it goes but I'm in no rush. Been working on updating Jeff's themes and now the official RC1 has been released it will be easier to keep up.