Update: Game Gear line-up announced. Both Game Gear and TurboGrafx have been confirmed for the 3DS Virtual Console.
Sega's battery hungry, colour portable didn't grab much of the portable market it its time, but was home to over 390 games, including Sonic the Hedgehog, The Lion King and Shaq Fu.
TurboGrafx-16/PC Engine, developed by Hudson/NEC in the late eighties, wasn't the most successful performer in the West, but did have a handful of gaming gems, including Blazing Lazers, China Warrior and Vigilante.
Pricing have yet to be announced, but both consoles will be available for the 3DS eShop/Virtual Console at some point in the future.
Update: The launch line-up for the Game Gear games has been confirmed: