If you have a rooted Android device, I recommend against rushing to install Android 4.3 for now. It appears that 4.3's new protection model may require re-rooting devices in various situations (and require a new, rather kludgy su workaround for now at least), and unless you have some reason to push through 4.3 quickly (which is a relatively minor update in most other respects) I would suggest holding off until best practice procedures have been developed and promulgated. If you don't root your devices, you won't care about this, and you can jump to 4.3 immediately and happily.

--Lauren--