Quote Originally Posted by IGN
The cake may be a lie, but here’s the truth: JJ Abrams’ long-rumored adaptation of Valve’s hit game Portal is in active development at Warner Bros.

During a press day for the home release of Super 8’s 4K Blu-ray, Abrams confirmed the Portal movie’s status to IGN. “We actually do have a script that’s being written for the Portal movie now at [Warner Bros.]. We’re really excited about the take and the pitch, so it feels like that thing’s finally on the rails.” Abrams’ suggestion towards Portal’s long development may remind you that it’s been eight years since he and Valve founder Gabe Newell first announced that Bad Robot and Valve were looking to work together at DICE 2013.

When asked about the status of the Half-Life movie, which Bad Robot was developing as of September 2016, Abrams said “the Half-Life thing, we’re not actively involved with at the moment.” While Portal and Half-Life are part of a shared gaming universe, it sounds like there’s no pressure to establish that world in a live-action Half-Life project first.
Portal Movie Still Alive, in Development at Warner Bros., Says Producer JJ Abrams - IGN