The Australian Ratings Board has rated Tails Adventure for the 3DS, hinting towards a March release on the 3DS’s Virtual Console.
It had SEGA Europe posted as it’s publisher, also hinting at a European release.
Never heard of Tails Adventure? It was one of two Game Gear titles starring Tails, and removed the speed element of Sonic in place of a more Metroidvania style of gameplay.
For more information, as well as gameplay, here’s my favorite Let’s Player’s playthough of the game.