The Diamond Comics Advance Reorder List is a great speculator tool. It shows what books retailers are going back to get more of, in advance of their release. They are actually putting their money up betting these books get big. These are the books people are talking about in shops, message boards, and websites. Here is the Diamond Comics Advance Reorder List for 5/31/15:
The wars are still tops, Secret Wars and Star Wars. New DC series make the list. Not much else other than Marvel and DC.
SECRET WARS #4
STAR WARS DIRECTORS CUT #1
DARTH VADER DIRECTORS CUT #1
THORS #1
OLD MAN LOGAN #2
MAD MAX FURY ROAD FURIOSA #1
AMAZING SPIDER-MAN RENEW YOUR VOWS #2
GUARDIANS OF KNOWHERE #1
INFINITY GAUNTLET #2
DEADPOOLS SECRET SECRET WARS #2
YEARS OF FUTURE PAST #2
ROBIN SON OF BATMAN #1
FUTURE IMPERFECT #2
HARLEY QUINN & POWER GIRL #1
RUNAWAYS #1
THORS #1 CHRISTOPHER ACTION FIGURE VAR
ARMOR WARS #2
SECRET WARS #4 CHRISTOPHER ACTION FIGURE VAR
BLACK CANARY #1
GUARDIANS OF KNOWHERE #1 GUILLOY GWENOM VAR SWA
DR FATE #1
MARTIAN MANHUNTER #1
DEADPOOLS SECRET SECRET WARS #2 GWENPOOL VAR
BATMAN HARLEY QUINN TP
SECRET WARS #2 ROSS 2ND PTG