Outside of their GM and maybe Afiya(the guy who makes their addons) i don't think there's anynone left from Wotlk/Cata days and another couple from MoP. Guild had a major break-up in the beginning of WoD and most of their core went and created Openness, you can see how they're doing now. So it's basically all new people from that point on. Even their current roster is already very different from their NH one.