One of the major points Marvel has been emphasizing in the lead-up to the release of Marvel Rising: Secret Warriors has been the diversity of the cast and characters. Now, it seems the film will actually have some landmark representation for a Disney animated project, in the form of LGBT characters. While Marvel animated projects have had characters who were LGBT in the comics (such as Max Modell in Spider-Man or Angela in Guardians of the Galaxy), but this would be the first time they were actually referred to as such in the show. Greg Weisman has confirmed that the upcoming season of Young Justice will have LGBT charcters as well, but with that not airing until 2019, it seems like Disney may beat them to the punch. While Disney Channel and Disney XD have both had some form of LGBT characters in their shows (Disney Channel having a character come out as gay in the show Andi Mack, and Disney XD having background LGBT couples in Star vs The Forces of Evil), this would be the first prominent example of it in an animated form.
The characters in question, at least that were confirmed to be LGBT in Secret Warriors, are the parents of America Chavez, Amalia and Elena, who are seen in this preview clip below.
America Chavez herself is also a lesbian in the comics, though it is unknown if this will be addressed or referenced in the film, though if her parents are allowed to be referred to as openly gay it would be hard to imagine why it would be off limits. It is also reported that the show will be a full animated series, potentially airing on the Disney Streaming Service, though we may need to wait for the films' NYCC panel to hear more about Marvel Rising's future.