Just to update, I went yesterday and what a ZOO!! I don't think I've ever been anyplace so packed with people for so long. It was like Bourbon Street at mardi gras. I think the fact that it was raining and it was the last weekend contributed. Some sites (Ferrari, Lamborghini) you had to fight your way up just to get a glance.
The BMW display wasn't all that exiting. The i cars were interesting looking but the active tourer didn't do much for me- hard to tell if it is an SUV or a station wagon.