Probably be another RC soon. The transaction log searching isn't working in RC1, and I renamed the folder for the XFMG and XFRM event trigger files to fix a warning from the PHP Code Sniffer tool, but other than that we've had no reports of any other breaking issues.
As long as you're not running DB Shop, which isn't compatible with this version, I can't see a reason why it wouldn't be ready for production
The only advice I'd give is to turn off the forum, then disable the DB Credits add-on prior to uploading the new files. Not doing this can lead to having to disable event listeners via config.php in order to let you access the AdminCP in order to actually complete the upgrade.
It's generally good practice to do this whenever you do a major version update to any product, but in this case I feel like I should mention it in particular since there have been reports of issues when upgrading with the addon live.
Fillip