Metroid Dread is a game which has been rumoured to be in production for 2 years, but the rumours have neither been confirmed or disproven. Retro Studios, who make the Prime games, deny having anything to do with it, but in MP3, one of the computer screens on the Pirate Homeworld comes up as "Metroid project Dread approaching completion" if you scan it (it's in the Research Facility area of the Pirate Homeworld, in the room where you let the metroids out, on the upper level by one of the doors).