everybody may soon switch over to archlinux.org for all repos.
first our new core packages are going to current. read here if you are unsure what is happening. all tests have been successfull until now. don't break the update progress at any point!
give me and the devs some time to update all the packages. as you may know the kernel and nvidia/ati and other kernel module packages have to be compiled with the same gcc version. so wait until we will have new kernel packages or fallback to opensource drivers if you are affected.
So good luck and happy pacman -Syu'ing.