If I install the initial set of updates, it borks my X config with the proprietary nvidia drivers. Doesn't seem to matter how I install them, I tried envy, the restricted drivers manager, and doing it manually. If I do it manually, it does install and I can bring startx up as normal via the command line using the nvidia drivers. After a reboot though, it pukes, and tells me there is no valid configuration. If I use the config tool that pops up on failure, it won't start the nvidia drivers, even if i manually choose them.
I just did a fresh reinstall, without the updates, and everything appears to be running as it should be (well, as it ran during the betas. Still have to set a decent resolution via 'sudo nvidia-settings', but it's done that since the first beta.)