The semi-annual toolchain update has been in testing for a good while, and is ready to move to stable.
With this update, many more packages from core did get the /usr/lib move, kernel and all depending packages were updated. The nvidia-310-19 update meant the need for a new nvidia legacy package besides the nvidia-173xx. GeForce 7xxx and below cards are no longer supported, and need nvidia-304xx, you'll see a pretty big warning for that on your next sudo pacman -Syu.
As always, make sure you're mirrors are fully synced, and any replaces/conflicts question answer with "yes".