Headup Games has revealed its next installment to the series will be utilizing elements from Valve's Portal. Titled Bridge Constructor Portal, the game features GLaDOS and various other trademarks from the series.
As Headup's announcement points out, the new game (which they've reportedly been working on for a year or so) makes full use of the Portal license.
It's an interesting move by Valve, which has a history of licensing out characters from its game franchises but has never really allowed another dev to make a full standalone Portal game.
The studio is best known for creating Bridge Constructor, where players create and design constructions and watch as vehicles pass over them to see how the structural integrity of their creation holds up against the laws of physics.
The game is set to release on December 20 2017 for Windows, MacOS, Linux and mobile. The console versions will follow in early 2018.