One of the biggest features that'll be part of 2010.02 is the ZFS de-duplication. But, here is a quick run down of all the things we're watching here:
* Solaris 10 branded zones
* Crossbow updates, better accounting performance
* ZFS enhancements: de-duplication, pool recovery, raidz3
* Integrated L2/L3 load balancer
* Major bug fixes introduced with non STREAMS network stack in 2009.06
As mentioned in a previous blog, you can follow these links to find the release notes for all the major pieces:
X related:
http://opensolaris.org/os/community/x_win/changelogs/
OS/Net related:
http://dlc.sun.com/osol/on/downloads/
You can also get a Heads up (highlights of some major changes that go in) here:
http://opensolaris.org/os/community/on/flag-days/
OpenSolaris release schedule:
http://hub.opensolaris.org/bin/view/Community+Group+on/schedule