For years now, there have been rumors and reports of a now-cancelled Half-Life 2 episode called Half-Life 2: Return to Ravenholm. The project, an overview of which can be found at the Combine Overwiki, was to be a collaboration between Valve and Dishonored-makers Arkane, and would, presumably, take players back to the creepy, zombie-infested village of Ravenholm. The existence and cancellation of Return to Ravenholm was confirmed by Valve's Marc Laidlaw in January of last year.
The folks at ValveTime have posted what they claim to be some new unearthed prototype screenshots from the long-cancelled project. They've compiled them into the video above, as well. For clarity's sake: These screens are old, and no one has any reason to think the project has been un-cancelled or anything like that.
Seeing as how the images come from an unconfirmed (by us) source and the game apparently never got very far into development, I'd suggest taking them with a grain of salt. I've reached out to both Arkane and Valve to ask about their authenticity, and will update if I hear back. Still... absorption? Interesting.
It wouldn't be an article about Half-Life unless I closed with some sort of Half-Life 3 joke, so… no, you know what? This one time I'm not gonna do it.
New Images of Half-life 2: Episode 4 / Return to Ravenholm [ValveTime, thanks Glenn]