Buffy the Vampire Slayer: Season 10 #8
And your Halloween present from the Scooby gang is... a return to Sunnydale! And there's a magical, monsterous party going down at the Hellmouth this year, thanks to Willow and the gang's re-magik-ing of Earth. I wonder what everyone is going as?
Earth 2: World's End #3
The War for the World continues, and masks start making a big difference! Under the helm of Dr. Fate, what are Nabu's intentions, now that he has control?
Multiversity: The Just #1
Reality gets in costume with thus celebrity superheo What If...? when Grant Morrison's multiverse-spanning narrative hits Earth-16. But the real question is... who's going to come out on the cover of People? (Fair Warning: It may be no one. [But there is that gay Flash character in the main Multiversity arc, so I can't imagine they wouldn't pass up the opportunity...])
Wicked + Divine #5
The solicit only says... "Showtime". Spooky.
Amazing X-Men #12
Now that the Wendi-demic has spread to US soil, Northstar and his twin sister are the only things standing in the way of us and furred out costumes for everyone!
Avengers and X-men: Axis #3
Mystique has joined the fight against the Red Onslaught, so this book is relevant to our list! I wonder who she is going to dress as to fight giant adamantium Sentinels? Also, where did that much adamantium come from? I thought this was supposed to be a rare metal.
Shulkie and team join up with Steve Rogers against their ultimate courtroom adversary: the Daredevil! (The Halloween tie-in is that he's a devil. Of sorts.)
Psylocke and crew have to try to recruit the mutant version of The Silence. Can they remember to do it? And will anyone be wearing a TARDIS dress? And can it be Dr. Nemesis?