With Doomsday Clock and Heroes in crisis wrapping up soon, it was revealed that Doomsday Clock will have its big reveal in issue 11 and issue 12 will serve as sort of an epilogue. What I think is interesting about this is that Doomsday 11 and HIC 9 (the finale) will release on the same day (5.22.19). The two series have to be connected to an extent, at least through Wally West.
Also (and this isn’t as important, but just interesting), but a fair amount of deaths during HIC were teen titans/titans. I only point this out because DC Rebirth (the issue) references the teen titans quite a bit. While I’m sure part of it was setting up future storylines, I think it’s fair to say the titans wouldn’t need much advertising to read.