Next Sonic has a project name of "Sonic Propel"(PS360, Wii U, 3DS). Take with a grain of salt.

[Xxain]

Take with a grain of salt. Sonic has a history of crazy rumors but also history of unannounced games being spoiled due to talkers( unleashed, black knight, colors and racing transformed)

http://www.reddit.com/r/gaming/comments/15zk5m/sonic_propel/

* translated by marucha.

*Propel is a working title
*360, ps3 will be launched first, As for the wii U version, it will be launched later
*Will be developed by Sonic team's Sonic Colors segment
*There is no indication it will be released for the next Microsoft and Sony units
*As for the success of the Sonic CD digital re-release, more realistic, Propel's art direction will be inspired by this
*As for Sonic's model, some of repetive elements from old classic and modern era like short stiff spines, slinder arms and legs and round body... to a certain extent will be modified
*A generation mechanics featuring slow geared development for more punctual distribution and abundant fine tuning, will be utilized
*The frequently enhanced "Hedgehog Engine", will be implemented in things like better illumination as well as motion blur
*Minimal plot
*As for eggman, 5 unique metal sonics, each with a unique design and functionality will be deployed
*Will probably do a Death Egg that reboots
*A dramatic decrease in interactivity, no more action base cut-scenes
*Eggman will speak abundantly more than the other characters
*Placing emphasis on stage investigation
*Assisting hidden characters in the stage, you can do this as a power-up options similar to flying that could open secret passage ways...
*Tales, in the way of Sonic 4, character fly ability assist function...
*Although you progress via Shadow the Hedgehog style forking levels, depending on several goal rings, it may be an inaccessible landmark(?)
*3 act level structure. When reaching any goal ring, decides the next place you start at in the next act. Whichever rings you obtain determines changes to the cut scene and story progression, as well will slightly alter the boss stage.
*When you hit a rank, there are are 3 hidden challenge deeds
*First stage is Evergreen Escapade
*As for the optional chaos emerald, for gathering all of those you must take different routes and it is necessary to do several theatres (playthrough?)...
*After emeralds are gathered up, you can do super sonic in all levels
*Secret Final Battle when all emeralds are gathered up
*Easy, Medium, Hard degree of difficulty mode, hint bubble as well as warnings/advice can be disabled.
*3DS version is being developed by means of DIMPS
*In the 3DS version, will use an entirely new graphic engine
*In 3DS version, primarily in 2D, via the touch pad control 3D segment shift
*3DS version differing story development
*In 3DS's both version, Tails however is subtited as an assist character

raw google translate
2013 • Propel Sonic the Hedgehog has been started at the beginning of • 360, PS3 is a working title, the version of the Wii U, the following: • that is being developed by Sonic Colors segment • Sonic Team to start later model of • Sonic inspired slightly shorter repetition of classical and modern now an art director realistic, the Propel more success • The re-released Sonic CD digital, with no indication of being developed for the machine Sony and Microsoft, the harder movement and slow to between the body a rounded spine, limbs and fine, change its contents, and distribution more accurately tweak more than • shorter, modified frequently • Use mechanical generation hedgehog engine that has been, Plot • Eggman minimum • running with motion blur lights and better we • try Death Egg to restart • deploy each with the design and features Sonics special metal 5, unique significantly reduced dialogue, cut scenes • more action-based Eggman says more than the other characters. • • Tails that acts as a power-up option