Wait why was there an unreleased Starfox 2?
Apparently it wasn't finished? IIRC the ROM has been floating around for a while, but now it'll be made available in its entirety.
It was a direct sequel to the first game on SNES that was about 95% finished, until Nintendo scrapped it very late in development, because they feared that the game's primitive 3D graphics would be compared to the superior graphical capabilities of the PlayStation, which came out around time time of Star Fox 2's near-release.
Of course, leaked builds of the game eventually came out, and the game was pretty much almost finished.