1.6 has hit the PTS server and there is no other way to put it, the change list is massive and there is a 14GIG update that goes along with it.
There is a new store, the justice system and the champion system coming in this one and that is just for starters.
http://forums.elderscrollsonline.com/discussion/148159/pts-patch-notes-v1-6/p1 is the place to go to read them as they currently stand.
It will be a few weeks before we see it on the live server, should prove interesting!