From the pictures i've seen it's thinner than the E50 Nokia is really making a commitment to the "thin is in" philosophy. I think it's a sharp looking phone but way over priced right now.
Couple of E50 comparison pics on flickr..
http://www.flickr.com/photos/e-series/398356669/
http://www.flickr.com/photos/e-series/398357534/in/photostream/