You could have guessed this. But it’s one thing to speculate, it’s another thing to get some form of confirmation. Sega have confirmed several new Sonic game for 2013.
In the November 2012 edition of Toys ‘N’ Playthings there is an interview with Sissel Henno who happens to be the Head of Brand Licensing at Sega (Europe). The interview is mainly focused on Sonic merchandise, in it we get some insight into not only Sonic’s future as a brand, but also confirmation for several new games to be released in 2013.