Board Thread:Question of the Month/@comment-29935361-20160910192139/@comment-679780-20161016045908

Still, it's not confirmed if Sonic '17 will be about time travel shenanigans. The only confirmation it will is Classic Sonic's re-apperance.

And if Time Travel is involved, chances are it will be through Chaos Control or a time machine just like in Sonic '06. May never get to see the Death Egg mk.II let alone Little Planet and the Time Stones.