I just upgraded my box at work to Haven, here is a short post to mention two links:
Other than that, I removed my xorg.conf and instead I put this to the xorg.conf.d dir. I also added "nouveau.modeset=0" to /boot/grub/menu.lst.
What else.. ah yes, I needed to change the keyboard model to evdev in the KDE System Settings.
Other than that, it went fine. :)
Update: the nvidia-173xx part is now fixed in both current and stable.