I think it will be a let's wait and see situation for the new zoom. The 24-105 isn't at its best at the very wide end where I want to use it the most. It also has a lot of distortion at that end. If the new zoom improves the wide end significantly over the 24-105 in a smaller package I will get it probably. It would be a nice lightweight travel lens to pair with one of the 70-something lenses. I hope the MTF charts come out soon.