Replied here, as this seemed more active -- and more suitable for discussion. Thought it'd be a good idea to let other's know that we're more people that feel the need for a stable release.
Thanks for the link. I was a bit surprised to see the reference to bugtraq -- but I generally read it in bulk, a few times a month, so I hadn't seen the post yet.
I diffed the two releases manually and determined that the security fix seems to be in lib/classes/class.module.inc.php only (and there are no other changes to that file). All the remaining changes seem non-critical, so I simply replaced that file with the new version to be safe before deploying the rest of the new release. It has been running on a relatively busy site for about 34 hours, so at least it didn't break anything.
Thank you for reposting the above information, and details regarding the fix. The original announcement was a bit light on detail.
It appears this is less serious on Linux. Can anyone confirm that ?