If you're eager to get your hands on OpenSolaris 2008.11, then you can get testing with the release candidate. It's been decided/announced that snv_101a will be the release candidate for 2008.11, and as is common the announcement includes details on how you can update and get testing now.

Please note, this release has a minimum memory requirement of 768Mb for the installer to work (Dave Miner thinks it's probably actually in the region of about 580Mb for those with VMs) at the moment, though this is being worked on in an attempt to bring it back down below 512Mb before the official release.

So get updating and testing and report any bugs you encounter.