While the software is yet to be published, the release notes for the new fishworks update is available online.
Besides bug fixes it have several new features such as:
Fibre Channel support
Multiple pool support
Update: It seems like bug 6924824 (destroying a dedup-enabled dataset bricks system) has been fixed for this release, but it has not made it back to OpenSolaris, or they have failed to mention this in the known issues. Let's hope for the former and that it will be fixed in OpenSolaris real soon, maybe even before this software update is available.
I've been using Unix, mainly Solaris for over 15 years. While Solaris was open I tried to be part of the community with this blog and by filing bugs and debugging.
During the days I work with standardization and implementation of the Unix platform at a large company. This involves design and implementation of Solaris and everything around it including security, performance, storage, virtualization and development.
I also work as a consultant part time and can be contacted at henrik (at) gigamega.se.