During a Spanish interview with a Sega Mexico rep, some interesting things were revealed...
First, Sega Mexico said that there will be a new Sonic Storybook game! He said that it's a trilogy, even though there are only 2 games in the sub-series; exact words, "No, it'll be a trilogy, just you wait..."
Second, he said there will be a new entry in the SUPERSTARS series!
Third, the rep talked about bonus stages for Sonic Generations. We know about the DLC stage Casino Night, and the Sonic Heroes-style special stages on the 3DS, but he talked about something different. When asked about the 3DS special stages, he seemingly hinted at special stages for the console. "I can't comment anymore than saying it can't be Classic Sonic without Bonus Levels..."
Next, he said there are plans to bring a Sonic Generations demo to Mexico, and it may include a new playable level, that may mean City Escape, or something new...
Now this is just plain random, while talking about the long forgotten Game Gear titles, Tails Adventure and Tails Skypatrol, came up a converstion about Tails getting his own game, the Sega Mexico rep said, "Something like Sonic Adventure 3...DS?"
Then, he said this: "I want to tell you that the comments on the chat that I made yesterday were misinterpretations by the users and listeners from the website."
Considering the fact that when a SEGA Spain rep leaked info on Sonic Genrations (Sonic Anniversary) and Mario and Sonic at the London 2012 Olympic Games, he also withdrew his remarks.
Storybook 3: I'm guessing it will be released as a Wii U exclusive, maybe even a launch title.
New Superstars: Expected, especially because of the recent success of Sonic & SEGA All-Stars Racing.
Sonic Adventure 3: I'm guessing it is just an opinion, and hoping it's going to be released on all consoles. Also, if this game is supposed to be a Tails-centric game then I think it's gonna suck!