In a perhaps unexpected collaboration (but really, one that makes plenty of sense once you hear it) Zen Studios and Valve have partnered to bring Portal to Zen Pinball 2.
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Portal Pinball will be available on PS4, PS3, and PS Vita May 26. There are several screenshots available (below) courtesy of Zen Studios' website. The blog post says it will come to all of Zen's pinball platforms, but a comment from the developers on the post states they cannot confirm Wii U release at this time.
Here's the official description of what players will be able to do in Portal Pinball:
"Guide Chell and Wheatley through test chambers by navigating portals, using aerial faith plates, defeating turrets and facing other obstacles, and battling against GLaDOS as you attempt to escape the facility and reach the surface. Team up with ATLAS and P-Body for their Cooperative Testing Initiative Multiball and wreak havok on the Turret Factory by discovering Ratman's hidden mini playfield."
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It's not exactly clear what format Portal Pinball will release in, but the PlayStation Blog says it is "will be available for Zen Pinball 2". That sounds like an add-on to the existing game and not its own title, though no price has been mentioned either (but I doubt it's free). Hopefully more details will be announced closer to release.