The working title for now (but I think it's a good one), Metal will see someone collecting very special items of metal for some reason or other.
Dr Fate's helmet? Etrigan's bracelets? Wonder Woman's tiara? The Golden Age Flash's helmet? Who knows?
Well, Scott Snyder does. I bet you can think of a few.
Come August, someone will get to have them all. And hey, maybe that metallic foil that DC Comics has been stockpiling may come in handy for a cover?