That's not a good sign. The previews I've read of it seem somewhat divided between saying it's really awesome and saying it's mediocre. Maybe they're full of shit, though. Although, it could be that they're releasing it in Europe first because they're afraid that it won't sell as well as they'd originally expected.
it's been downhill on consoles for Mariokart ever since MK64 I m afraid. Double-dash was OK but it just didn't "feel" right. It actually felt like driving a CAR not a GO-KART!! As an example, I first drove in Mariokart64 before I headed out on a real go-kart. The driving was so similar (down to how you shift your weight to "powerslide") that I was amazed! When I tried DD however, it just felt like I was controlling a buggy or something, but certainly not a go-kart. I see the inclusion of bikes as a point of debate for purists, as well.