Here's a potentially promising teaser of what might be possible for the WC4 Fan Remake. Pedro's recently done some experimentation with AI-assisted video enhancement, and the results are surprisingly positive. He reports that the ability to upscale still images is fantastic, so this will help sharpen up the game flow sets at least. There's a lot of work yet to be done to refine the video elements, but this promising technology will likely improve by the time the remake is ready to go. What's already possible seems to border on something from Star Trek, so we can't wait to see how it develops!
For stills it's excellent, we can definitely use this tech to up res the room images. For motion a lot of artifacts creep in. Still by the time WCIV is good to go I bet this technology will be good enough. If they can fix eyes in motion it would be useable; currently it's recognising shapes rather than features. For a face that's a problem It could happilly be used on CG scenes.