New games suppose to be published by JoshProd and Rushongame are shown but not listed yet.
You can see a YT video with many different style games and you can even recognize some of it like Saber Rider and the Star Sheriffs. So we can guess only what games will be released for Dreamcast but we can be sure that there will be Dreamcast games.

Direct link: JoshProd and Rushongame official 2018 Video Games Release - YouTube

[youtube]https://youtu.be/dAHYOwr0sY4[/youtube]

Source: Dreamcast Ultimate fb group... i missed it in my YT timeline.
P.S. It is posted in lounge because nothing is confirmed yet.