KomoriMan has posted an Official Voting Poll that will help Gazillion Games determine what costumes to create going forward for Marvel Heroes.
They have compiled a list of costumes that were suggested by players in the Official Forums. The list includes 19 X-Men, 8 AVENGERS and 10 OTHERS hero costumes.
The expectation is that they may make the top five costumes from the voting process. Also, some of these costumes may fall under the "Enhanced" category which involves new voice acting which takes more time to complete.
Voting ends April 10th, 2017 so check it out ASAP!