Another release of our workhorse Solaris 10 is near completion. I have dug up some of the enhancements from what's available outside of SWAN. There seems to be quite a bit of new stuff going into this release:
- Turbo-charging SVr4 packaging (speed enhancements for install/patch/upgrade)
 - Zone parallel patching (already available by patch 119254-66)
 - Interrupt resource management
 - ZFS L2ARC
 - ZFS user/group quota
 - Wicked fast memstat
 - Extended VTOC (for booting from > 1TB disks)
 - NTP version 4
 - FMA support for intel Core i7
 - MPT driver enhancements
 
This will also be the first release that will be transferable into a S10 branded container in Solaris.next.
All this is of course my own educated guesses based on what i could find outside of Sun, but I would be surprised if it is much different from what will be released.