The new Portal announcement isn’t quite Portal 3, but rather a crossover with the Bridge Constructor franchise. Developed by Headup Games, Bridge Constructor Portal is set on a 2D plane in Aperture Labs, where players will need to mix portals, gels, and bridge construction to reach the exit. The game is a fully licensed crossover and will serve as GLaDOS’ latest testing grounds. It is unclear if Ellen McLain will be lending her voice to the game, but I don’t think it will truly be a Portal game without her.
Bridge Constructor Portal is set to launch on Android, iOS, Linux, Mac, and Windows on 20 December 2017. The console version will launch on PlayStation 4, Switch, and Xbox One in Q1 2018.