Here's hoping that Bethesda remembers to update the CK when any update goes live to reflect changes, and remembers to make it so that Mods are backwards-compatable (In other words, makes the game so it can recognize an "old mod" format, and convert data types as needed)
I think it will always be backwards compatable, it just isn't forwards compatable.
I opted out of the beta, and saved my mod. I don't want to risk it anymore, you guys are scaring me too much.

I appear to be succesfully working back in Skyrim 1.4. I think it only affects you if you have Update.esm as a master. Regardless, I'm in the safe zone now.