No, definitely not, that Plasma 6 is in alpha phase means that it is not yet ready for production, and is meant for being use specifically inside a virtual machine. The same in Arch and any other rolling release distro.
Arch might package it for their KDE-Unstable repo though. But that is also a repo people have to manually add to get it.
With good reason! Plasma 6 is not yet ready for general purpose usage in any shape or form.
No. Maybe a project repo will have the alpha version, to start the work into packaging Plasma 6, but it will not reach Tumbleweed itself.
I've tried it in a VM and it was very buggy, so, I doubt it would reach any distro in this stage anytime soon
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