Unless you're talking about Birds of Prey, which would be a little off the mark seeing as that's what the new Birds of Prey comic is for, the sequel to Suicide Squad isn't coming out for two years, and was of course even further away when the previous series ended at #50. It seems pretty clear that they were aiming for a much quicker turnaround on the new #1, liking tying in with the end of Heroes in Crisis.
What I mean is that, if this exact comic had been announced when the previous series ended at #50, it would've been a little unclear just what about this warrants a relaunch