Why no IS? That's really lame.
Also, why an 82mm filter size? At that size, or once you go past 77mm, filters take a huge leap in cost. Also, many people I know use a step up ring to 77mm to have a unified filtered system (including myself). So if I were to go to 82mm, I would have to buy all new filters including a Fader ND for video, which at 82mm, would be hard to find and really, really expensive.
They have IS in 17 to 55mm EF-S, so why not add it to 24-70, especially when it's the MOST REQUESTED feature by nearly everyone.