At first you might have thought "Snapshot-based boot environments in Solaris? Old hat!". And indeed, this is part of Opensolaris for quite a time. However it wasn't part of the the ON consolidation. With the implementation of PSARC 2010/059 and RFE like "6964804 SNAP BE management into ON" this mechanism is now part of the consolidation.

Read More about [Snapshot based boot environments into OS/Net...