He was asked whether or not he would like to use some of the Fantastic Four characters in Guardians of the Galaxy? Gunn responded, “I probably wouldn’t add Ben Grimm to the Guardians team even if they were a part of the MCU. And of course I would love the FF to be a part of the MCU,” he stated. “Fox owns so many great villains and cosmic characters I would love to play around with including Annihilus, and I think they own Kang.”
Given the recent troubles FOX has experienced in trying to get the Fantastic 4 franchise off the ground, it wouldn’t seem far fetched that a deal could be worked out if Gunn wants the characters bad enough.