Just watched it too. It's not so much of a drastic change from outside.
Not sure about inside and the enigneering though.
Unlike E46 to E90, it was quite a big jump in terms of handling, comfort, performance and also the style.
Of course, E90 is also more quiet then E46, a bit too quiet to me... I still like the E46 sound.
Just only my personal opinion, ok? I don't want to offend E46, E90 and future F30 kaki all at the same time.
hehe....