At last - the 35mm f/2 I was waiting for, specifically with USM & improved aperture. If the price is right, I'm buying one.
Alas, if the new 24 and 28 2.8 IS lenses are anything to go by, price will be substancially more than the old 35 f2......
With improved diaphragm and added IS & USM, it would be surprising if Canon didn't raise it's price significantly. I wouldn't make a big fuss if the price was raise 60% to U.S.$500
Also, consider it's position relative to the 35mm f/1.4 L USM - having the same diaphragm (8 rounded blades) & USM, the two lenses are not as differentiated as before - cash & IS would win many over one f stop.
On the other hand, Canon might replace the 35mm f/1.4 L with a 35mm f/1.2 L, and make even more people happy.