According to two separate sources, Sonic Colours could be getting remastered soon for current generation consoles.
The first of these sources is IKSample, a German production company that reportedly works on game localisation and audio. Twitter user @OnTheDownLoTho recently pointed out that the company has Sonic Colours Remastered listed within its 2020 list of credits. The second source is French retailer Sogamely, who has "SONIC COLORS ULTIMATE - LIMITED EDITION SWITCH" listed for $34.99 on PS4 and Xbox One.
Of course rumours like these should be taken with a grain of salt, but Colours does seem like an obvious choice to receive a remaster. Many fans would have likely missed out on the game due to it being exclusive to the Wii, and it's one of Sonic's best received outings in recent memory.