Well, they said it would be release on October 8th, and they did not disappoint.
The new code, internally called 2013.1.0.1 and what marketing is calling ZFSSA OS8 or AK8 is out now. Download from MOS.
The numerous updates are hard to all get a handle on at once. This readme file will help: https://wikis.oracle.com/display/FishWorks/ak-2013.1.0.1+Release+Notes
I will be loading it, playing with it, and showing some of my favorite things coming up soon, as in the next few days.
Much of the improvements are what you can not see, such as the improved ARC and RAID benefits.
Lots to talk about. Especially if you need to mix trays. Be careful. Read the file. Stay tuned.