During today's DICE keynote conversation between movie director J.J. Abrams and Valve co-founder Gabe Newell, the latter noted a collaboration he's looking forward to making a reality.
"We're going to try and figure out if we can make a Half-Life movie or a Portal movie together," said Gabe Newell.
The two sparred on storytelling methods in movies and film, and used scenes from each other's work to illustrate how player agency can augment storytelling, and how films can use "forced" foreshadowing to set up later events. According to the creative pair, they wanted to pursue this dialogue more seriously, and now hope to collaborate on a film based in some way on Half-Life or Portal.
There are no details available beyond this brief announcement, likely because the process is still in its early stages.