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

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I would be just fine if they did Sonic Generations 2. That game was so well done.

Also I don't know why they just don't keep it a side scroller like the originals. It has worked all these years for Mario. Just create new, bright, and beautiful worlds and I don't think anyone would complain.