Sonic Retro's been discussing
this proof of concept video from The Taxman and Stealth of their initial work on an Android and iOS widescreen version of Sonic 3 & Knuckles. As you know, Sonic CD, Sonic 1, and Sonic 2 have all been released on these platforms in widescreen. Many people are pushing for Sonic 3 & Knuckles to receive this treatment, but SEGA has indicated no interest at this time, with a few people hinting that they have information pertaining to the supposed issues preventing the game's remaking (e.g., music). One thing that all are in agreement on is that SEGA of Japan is the biggest hurdle in the way of such a project, and fans are hoping to harness to power of social media to get attention.
Now, I can't imagine anybody on TSC would want such a thing. After all, a remake would have less glitches, and the current Sonic 3 & Knuckles competitors on TSC are all about splitting the game wide open and making the engine cry while performing time attacks that avoid as much of the actual level as possible. Wouldn't making people play the levels from start to finish as intended spoil the fun?
However, if you're feeling sympathetic to the average Joe who may want the game anyway, there's a Twitter hashtag going around that you can use to help further the cause. Use the hashtag
#BringBackSonic3 and address
@SEGA_OFFICIAL with your thoughts.
Be sure to mention your awareness that it may require changing some assets due to rights issues (e.g., Sonic & Knuckles Collection was a release of the game for Windows 95 that used new music in many parts of the game), because if SEGA believes we'll only take a 100% faithful port of the game, then rights issues will bar any release. If you either really want the game or just like hopping on the bandwagon, try supporting the cause!
While you're there, if you want your Twitter home page flooded with records, why not follow
@TheSonicCenter? Also, why not follow
my page so that I don't ban you? *flees*
EDIT:
GeneHF's thoughts on the topic.