Nothing as far as we know. I can't recall if it got more powerful after Buffy was brought back from the dead, disturbing the slayer line. In that case, it either a)is just as powerful or b)lost it's power because it needed the Hellmouth(could it use another). Or c)it's no better or worse off than before season 7. There's also alternative d)there is still a disturance in the slayer line, and it's trying to find a way to use that.
I think we can assume it's "alive" and fine, and out to destroy existance.