It was revealed in a scene in the film's second half that Trini/Yellow Ranger (played by Becky G) in which she was asked if she is having "boyfriend problems", and when she denies it, she was asked if it actually "girlfriend problems."
As for the Ranger who has autism, it's confirmed to be Billy/Blue Ranger (played by RJ Cyler), and it was confirmed in a scene where he talks about being on the autism spectrum. That being said, this is the first time a big budget superhero film will feature an LGBT superhero and a superhero who has autism.
Power Rangers is set for a March 24, 2017 release.
[Source: Anime News Network]