http://mynintendonews.com/2013/01/24/sega-to-announce-new-sonic-game-for-wii-u-and-3ds-next-month/
initial source http://www.sonicstadium.org/2013/01/rumour-sega-to-announce-new-sonic-game-next-month/
It appears next month Sega is announcing a new Sonic game for the Wii U and 3DS (as well as PC, PS3, and 360.)