Originally, Sega planned to launch the Mega Drive Mini (as it's called overseas) last year in Japan only, which would have basically been a port of the Genesis Flashback HD that AtGames built for the US market. However, Sega later delayed the release to improve the quality.
Fast forward to now and the Mega Drive Mini is back on the roadmap, only now without the participation of AtGames. Sega has taken total charge of the retro reboot, and plans to launch the Mega Drive Mini globally, including in the US, where it presumably will be marketed as the Genesis Mini. That's how we'll refer to it from here on out.
The Genesis Mini will launch with 40 games, including Sonic the Hedgehog 2, Castlevania Bloodlines, Comix Zone, Gunstar Heroes, Powerball, Puyo Puyo 2, Rent-a-Hero, Shining Force, Space Harrier II, Madaou Monogatari, ToeJam & Earl, and Wrestelball. It's not clear if more games can be added later, but we suspect that will not be the case.
As is customary with these retro refreshes, the Genesis Mini will much smaller than the original 16-bit console—small enough to fit in your hand, as depicted above. However, the controllers will be the same size as the original.
In Japan, the system will be offered with one or two controllers bundled in, each with six buttons, while the US version will come with two three-button controllers (it's not clear if there will be a cheaper single controller package as well), according to Kotaku. These will connect via USB. In case you're wondering, the original controllers will not work with the Genesis Mini.
The Genesis Mini will be available starting September 19, 2019. Pricing has not been set for the US, but in Japan, the single-controller package will cost 6,980 yen (~$60 in US currency) and the dual controller package will cost 8,980 yen (~$80).
As expected, the console will connect to TVs via HDMI. It will support 720p (HD) and 480p.