Bjoern Zeeb has updated the jail code (Wikipedia | FBSD Handbook) in freebsd 8-current with the following new futures:

  • support of several IP for every jail
  • support of IPv6
  • Jail can now be created without IP address support
  • SCTP is updated inside the jail code
  • cpuset is capable to assign processes to a specific jailid or irq
  • hostname support for alternative jail names

More information on the complete changes here