#Plasma6 should be hitting #Tumbleweed in the next released Snapshot. That being said, upgrading your #Kalpa installs should technically be possible, just as it is on Tumbleweed, but it's not something that the Kalpa team is ready to "bless" as supported, until we do some testing.
Upgrade at your own risk, use a VM, do whatever it is that you normally do, when you want to try out the new and shiny.
