Retro-bit, the makers of retro clone hardware, announced that the company signed up with Sega to make accessories for the Genesis, Saturn, and Dreamcast. While not an official confirmation, this could suggest that these Sega consoles could be readying a comeback.
A Dreamcast mini isn't the most outrageous rumor at this point. After the success of consoles like the NES Mini and SNES Mini, even Atari is getting into the retro throwback game. Sega, which arguably has an even more tantalizing retro library to revisit could do very well capitalizing on the retro wave.
In a blog post Retro-bit acknowledged the growth of retro gaming in recent years and announced that "The first products and concepts under the agreement include several accessories that feature the same great quality as their original Sega counterparts like the original console port, but also with modern upgrades such as a USB port for PC compatibility and Bluetooth wireless technology."
The Retro-bit accessories will debut at the Innex booth at CES 2018. Whether we'll see a Sega retro console by then remains to be seen.