Sasquatch Games, creators of the Primeval Thule setting for DnD 4th and 5th Edition, Pathfinder, and 13th Age, as well as the team behind the excellent Princes of the Apocalypse Campaign for DnD 5th Edition, is bringing Alternity back in 2017.
For those that don't know, Alternity was a Science Fiction RPG created by TSR and published by Wizards of the Coast. It had settings like Star*Drive, Gamma World, and Dark Matter. One of the founders of Sasquatch Games, Richard Baker, was also one of the Designers of the previous Alternity game.
From the information released, thus far, the system will use a d20 and will feature all new settings.
Check out the announcement here.