Sucks that the superior cancelled XBLA remaster will never see the light of day officially it seems. Thank god it leaked at least and there's also a fan decompilation project that's been underway for a little while.
Regardless still it's a big deal to see it release at all, I'd imagine dumb contractual stuff is why they aren't using the XBLA game. I wonder how long they signed off for too (It's licensed it won't last forever and companies are rarely forward thinking when it comes to this stuff) and how many years it'll be until it inevitably get's stripped from the N64 NSO library.