Sonic Ruuuuumors: New Sonic is ambitious shelved idea brought back for PS4/XBO, Colors possibly to PC, SoJ did not intend Sonic 4 to be Sonic 4; SoA pushed it.

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Wyrdness said:

Wasn't Sonic 06 said to be ambitious at the time as well and that ended up... Well you know the rest.

The problem with 3D sonic is that they tried to be like 2D Sonic and it just hasn't worked no matter what they try, they should have made the 3D games their own thing and keep the 2D games around for the classic experience.

Sonic 06 was a rushed game which was ruined by glitches and broken gameplay. This one has been in development for at least 3 years and will come out next year.