Mane6, the developers behind the non-profit fighting game My Little Pony: Fighting is Magic, have received a Cease and Desist letter from Hasbro asking them:
to cease game development, remove any materials that might contain My Little Pony characters, names, locations or related elements from the sites we control (Our site, our youtube, our twitch), and "cease any further use of [their] MY LITTLE PONY property".
They've tried negotiating with Hasbro, but they haven't received a response yet. Nothing's finalized, but this doesn't look good for the game.
Despite not being a fan of the show, FiM certainly looked like a competent fighting game which was on track to being the 8th game at Evo 2013 (until it was removed for not being a complete one). I would have linked a video, but they've all been removed now.
The creator, executive producer, writer, creative/character designer and storyboard artist behind the show Lauren Faust has proposed to help the development team with a potential new project, so we'll see if anything comes from that: