blizz announced that 560-690 gear will scale to 690 in PVP at the start of the next patch.it's a huge slap in the face for those who grinded 660 PVP thru various methods. the 600 gear you receive from ashran, glad sanc workorders, and random BG, you may want to save since it will be equal to what is now BIS, but better...
what makes PVP 600 gear the sweet spot, it can be fully MOP enchanted, shoulder inscription, leg armor, belt buckle for gem.
level-95 PVE 600 gear from skyreach normal, even better, in that items can drop with socket slots at random, plus it takes all the enchants 600 PVP gear does. the 600 PVE gear with numerous overall sockets will be seriously strong at the season start