Unleashed HD, making it more accessible to people who don't have access to a 360, PS3 or PS3 emulation worthy computers, which is a large amount of people. It's a surprisingly hard Sonic to emulate, even 06 runs decently with a few added bugs (but reduced loading times) in certain builds of Xenia (and there's also P-06 but I'm a purist so I don't consider that the xXx~*tru 06*~xXx). Colors doesn't require too beefy a PC and Generations, Lost World and Forces have PC versions.
Also a remaster of Heroes with probably retuned physics because WOW! I Do Not Want To Go This Fast In 3D Adventure Space Where Every Level Is Floating In The Middle Of A Skybox Atop A Bottomless Pit!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Why would you ever use anyone not from the Power class I s2g