Today, Sega officially announced the tv-series, Sonic Boom, but also revealed a new game for the tv-series as well exclusively for Wii U and 3DS that acts as a prequel for the show.
Video game reveal trailer: Link (Sorry, but I can't post two videos on the same post for some reason)
So far, it's looks rather promising to me, as it gives the franchise some new life, while still holding true to it. Keep in mind that they stated that it won't replace the original franchise.
The Wii U version will be developed by Big Red Button Entertainment, who is comprised of former Naughty Dog developer, while the 3DS version is being developed by Sanzaru Games, who worked on Sly Cooper: Thieves in Time.