From what I've heard, it's the opposite and Milestone is just waiting on DC. Before Rebirth, I think Hudlin said they had pages ready to go out. But since Rebirth happened, it probably got pushed back more.
Since we're on the topic, I actually just visited their facebook page and it appears something might be coming up soon.
From reading on BC, there actually seemed to drama and stuff going on. Even Priest went to meet with them to see what was going on.