Sega just revealed its next miniaturized console to be the Mega Drive 2 (or the Genesis Model 2). The latest mini model is announced only for Japan currently, and ships later this year.
Mega Drive Tower Mini 2
SEGA has announced the Mega Drive Mini 2, comes with 50 pre-installed SEGA CD and SEGA Genesis games
SEGA's Mega Drive Mini delayed to October 4 in Europe and Middle East - Neowin
SEGA's Genesis Mini is currently discounted to $50 on - Neowin
SEGA Reveals New Mega Drive Mini 2 With 50 Games Included
SEGA Reveals New Mega Drive Mini 2 With 50 Games Included
A mini version of the Commodore 64 will launch next year - Neowin
Sega Mega Drive Mini 2 release date, price and games list
A look back at console dev kits (image heavy)
Sega announces Game Gear Micro handheld retro consoles - Neowin
SEGA has announced the Mega Drive Mini 2, comes with 50 pre-installed SEGA CD and SEGA Genesis games
Sega Mega Drive Mini 2 announced, comes with 50 retro cartridge and CD games - Neowin
Mega Drive Mini 2: Sega Title Collector's Edition - DX Pack - LIMITED EDITION
Sega Megadrive Mini 2 nIGHTFALL Blog / RetroComputerMania.com