Throughout September, Marvel will have variant covers for a number of its titles which will feature a cosplayer. The list of comics / cosplayers (so far) is:
A-Force #1 Cosplay Variant by Jay Justice
All-New Inhumans #1 Cosplay Variant by Yaya Han
Amazing Spider-Man #1 Cosplay Variant by Aaron Rivin
Astonishing Ant-Man #1 Cosplay Variant by SoloRoboto Industries
Avengers #0 Cosplay Variant by Michael Cox
Captain Marvel #1 Cosplay Variant by Judy Stephens
Daredevil #1 Cosplay Variant by Patrick ‘Rick’ Lane
Doctor Strange #1 Cosplay Variant by Allen Lee Hansard
Extraordinary X-Men #1 Cosplay Variant by Amanda Lynne Shafer
Guardians of the Galaxy #1 Cosplay Variant by Contagious Costuming
Invincible Iron Man #1 Cosplay Variant by Dale Oliver
Ms. Marvel #1 Cosplay Variant by Soni Balestier
Nova #1 Cosplay Variant by Cap Santiago
Sam Wilson Captain America #1 Cosplay Variant by Eddie Newsome
Spider-Gwen #1 Cosplay Variant by Kathrine Zan
Spider-Woman #1 Cosplay Variant by Yashuntafun Cosplay
The Mighty Thor #1 Cosplay Variant by Sarah Jean Maefs
The Mighty Thor #2 Cosplay Variant by Kevin Spooner
Uncanny Avengers #1 Cosplay Variant by Miss Kit Quinn
Uncanny Inhumans #1 Cosplay Variant by Kalel Sean
There is at least one more cover that has not been announced.
Sample covers:
More covers here