Walter "Copper" Yarbrough posted on the Camelot Herald that the servers are down early this morning to bring you patch 1.64. So far the patch notes have not been released, but will in time I am sure, so keep an eye out for that news later this morning, for now here is what Mr.Yarbrough had to say:

We'll be taking the servers down at 8:00 AM EST this morning, August 12th, to bring the changes in patch 1.64 to the live servers. Our apologies for the late notification - we expect that the servers will be back online before noon.