We have the NES Classic and the SNES Classic. The Genesis Classic was due out this year by “AT Gamer), but as of this site, it has been pushed back until 2019. It seems as though, Sega made a wise decision:
Sega has also cited how it wants to achieve a level of quality that fans would expect. It has reportedly established a system to rethink the design of the device, with the original core team now working alongside proven Japanese software developers.
If the system is being designed with the Genesis core team, we are definitely in for a treat. Take that AT Games!