0 days for me! I managed to pry a copy from the EB hands...
Ok, here are my first comments on it. EXCLUSIVE EXCLUSIVE EXCLUSIVE!
I'm feeling lazy so I'll just paste what I said in the Aussie thread...
I'm going to warn about minor spoilers, but most of it has been available at the official site.
~ There are lots of things happening on screen - items everywhere, mario-related baddies trying to get you, opponents trying to get you, takes a while to adjust, even at the front of the field.
~ Flower Cup has the coolest obstacle I've seen - moving tables on a cruise ship LMAO! And you can release a Chain Chomp somehow, because one flew by me after I passed it, chomping its way into a wall. Also, there is a beach level where you have to dodge those annoying beach critters from SMS, but you can knock them out with shells. Funness to the max.
~ If bright and cheerful are not how you like your graphics, stay away.
~ You start out with three karts, and unlock more by winning golds in the championships. I want Wario's Pimp Mobile dammit!
~ Wario has the coolest special weapon - a bob-omb that diables you attacker for a short period if you get hit. Yoshi has a targeting egg that spits out various items on the track on impact. I played with Baby Mario as well but didn't find his unique item...
~ Also, there are different reactions to hitting targets, such as the kart flaming if you hit fire, or the kart sparking after you are hit by lightning (yes, the lightning is back, actually all the old weapons are), good to see attention to detail.
~ The fake item boxes are more obvious than their MK64 equivalent.
Overall, IGN was way off. Their review is very contradictory, so I'd disregard it. If you're looking for a rating, I give it a 9.4, because I played way too much MK64 and the easy difficulties on DD are way too easy. I can't comment on multi because I have no friends at midnight for now, but I predict it will be better than single player.