you can upgrade first, and monitor it closely for a few hours; if any issue, you can switch back to previous version, this is low risk. or switch back to previous version when you're away from computer ... nearly 0 risk.
It's the new lsphp that isn't that easy to downgrade on Cpanel box (takes time to recompile php). As the server I want to run it on has quite a few important production sites I'll wait a couple of weeks. I'm very impatient to try this out as this new version answers every feature I wanted !