For those of you waiting for ZFS on-disk encryption, here is an video interview with Darren. He gives a overview of the projects and even get's into some preliminary thoughts about performance.
It still looks like the Integration Target is Q1CY10 which would place it in a build quite close to the OSOL 2010.03 release (which targets build 134). But it has been pushed forward several times before, also all the Oracle integration will probably not make it happen any sooner.
Talks I have given
5 months ago