Part of the problem is trying to work with the folks over at Sonic Retro - not they they're bad people, but the goal was to organize some kind of joint event thing where one would lead into the other and we'd have like a solid month of Sonic fandom activity. But for lots of reasons that fell apart, so things got delayed.
FastROM version - FastROM addressing and enabling applied. It would play sped up on flashcarts such as Super Everdrive which may or may not be a good thing.