The biggest complaint I have about it is the front bumper. If someone were to come up with a nicer front bumper design, I think people would like this car a LOT more. There's no question that this car is MUCH more aggressive looking than the current MS3, other than the hood (and for a performance car that seems about right).
As far as the interior, I think that the quality has increased; however, I'm not a fan of the design. I think that these new seats are a HUGE step backwards from the current MS3 Grand Touring seats (the alcantra inserts are great). Also, I always switch out my stock radio with an aftermarket double-din touchscreen unit, and I don't think one of those would go well in the new MS3 at all (it would be slanted very far upwards, and I would image you'd lose the functionality of the screen above it....more-so than in the current MS3).
It's nice to see the improvements in quality (materials and fit/finish) though and things like keyless ignition. I decided that I didn't want to wait for this car (and pay a premium for it when it first comes out...all buggy and everything), and will be buying an 09 MS3 GT.