I apologize if this topic has already come up, I didn't see it.
So, Apple hasn't released any security updates for Mountain Lion (or earlier OSes) along with the release of Mavericks. I sent an email to my Apple Systems Engineer and he could not confirm or deny if they would release one (mostly as he doesn't know).
I don't know about the rest of you, but this puts me (and my company) in a bad position. We cannot turn around an OS update for our Mac users as fast as we would like. We have application dependencies that need to be vetted. We need to setup our ability to image, netboot and do many things to make sure we can manage Mavericks.
I think it is unacceptable that Apple didn't give us a clear heads up that this was coming. It is irresponsible of Apple to release an OS without a security patch for the previous OS (esp when you include a notice of what has been patched); thereby giving hackers all the information they need to exploit the last version of your OS.
So what is my point? If your in the same situation as me, I suggest you contact your Apple Reps (or send an email to Tim Cook) to vent your frustration with this move. While I understand their need to move user's forward to the latest OS, they have infuriated the very people (at least this one) at enterprises that they need on their side.
