XEN and ZFS Status?

[EchoB]

Hi all :) Can anyone point me in the direction of any detailed docs or 
perhaps just an answer on here re: production status of Xen and ZFS when 
7.0 is released? I have read somewhere that ZFS is experimental at best, 
and wanted to confirm that. Also, using Xen would be a great plus in a 
production environment.

Also  - read somewhere about 8.0-Current - whats that all about? what 
are the differences between 7.0 and 8.0?
Ciao!