I hope that the full reveal isn't just an April Fools joke, with or without fake screenshots. If they are earlier versions of released games, I hope that there are noticeable differences. The prototype hucards look very cool and much nicer than any I've seen in the past.
Knowing Chris, he could very well have programmed a SuperGrafx demo (like China Warrior with added parallax and/or multiple human enemies onscreen) to release as a "long lost" rom on April 1st. I really hope that it isn't a prank, but it will likely still be pretty cool even if it is.
Maybe one of the games is R-Type SGX.