If this is the final version, the good thing is no IS & keeping external zoom shouldn't mean a dramatic price increase. On the other hand, I'll be quite disappointed with no internal zoom and to a lesser extent no IS. This is supposed to be the top of the line lens in this range and leaving out these two things I think is a mistake. Weather sealing while good would be better with internal zoom and slow SS can only be helped by IS especially at the longer end of the zoom range. I'll probably still buy it once I pick up a FF body this year, as I'm sure Canon will improve on it's already great optics, but after the kit lens and my 15-85, I hate external zooms...