I sank ENDLESS hours in GT4. That is one of my favorite games of all time. I would love to see a retooling of GT4 in the GT 5 or 6 engine, but I'll take this.
I still have a save that I kept because the in game days were right before the black GT1 Cars went up in the used section.
This can either be a really great release or a really crap one. The original Rayman is a gem. It is deceptively hard though, so a remake with potential to buff the player wouldn't be the worst thing. I also don't hate the modern Rayman art-style, it would work pretty well with the original world and landscapes.
Fingers crossed it doesn't suck.