The wait has been too long, this looks fantastic.
If I were to nitpick though, I'd have to complain about the Monster Men reference, not because I disliked the crossover, but because the reference will feel out of place when the whole story (Rebirth, 1-4, 7-8) are collected in trade, and it doesn't really add much to anyone who read those events. It just sort of exists to acknowledge that it happened. This kind of this is a pet peeve of mine. The stories that hold the test of time (Think Year One, Arkham Asylum, Long Halloween, etc.) aren't dragged down by current continuity for it, so it reads much more like a standalone story.
Dammit I said I was going to be positive, but here I am nitpicking. Otherwise, really looking forward to this.