The game's third universe, in addition to Amazing and Noir, will be the futuristic 2099 one.
Activision confirmed that the third universe featured in Spider-Man: Shattered Dimensions will be the Spider-Man 2099 universe.
So far, two other universes have been announced, the classic Amazing Spider-Man universe, featuring Kraven the Hunter as the main boss, and the Noir Spider-Man universe, which will feature Hammerhead and the Goblin as bosses. The 2099 universe will feature a robotic Hobgoblin as the main boss.
The character of Spider-Man 2099 originated in 1992 as a possible future for the current universe. The series last for 46 issues until it was canceled in 1996. The series, which was part of a universe that featured a variety of futuristic Marvel characters, has been revisited in the comics numerous times since, but this is the first time Spider-Man 2099 will show up in a video game.
The fourth and final dimension will be revealed sometime soon, most likely around the San Diego Comic-Con. The latest trailer, which revealed the 2099 universe, hints at the last one, which looks like it could involve symbiotes or zombies.