It sort of got leaked before, but now it's official - Lovers in a Dangerous Spacetime will be coming to Nintendo Switch October 3rd, 2017.
Lovers in a Dangerous Spacetime is currently avaliable on Steam, PlayStation 4, and Xbox One - but the developers said in a tweet: "Since the #NintendoSwitch reveal we knew it was the perfect platform for LOVERS. We're super excited to finally share it with you all!"
Based on the trailer and gif, it does appear it will contain the 4-player update. It will be out on October 3rd.