The bugaboos are meant for different stages, as far as i can tell. One has a bassinet-type thing and the other acts more like a toddler stroller where the child is sitting up. (Don't quote me on that -- it's 5am vegas time) But the bee was supposed to be their less expensive, lighter weight stroller -- something kind of like the umbrella strollers we all buy for easy travel. At least, that's the impression I get! I'll find out more about them today or tomorrow at the show.
Just a side note -- one of my coworkers bought a bugaboo for her infant, who is just about three months old now -- and although he's a taller baby than the average, he's already too long for his bugaboo! needless to say, she is NOT happy.