The new Canon 24-70mm f/2.8L II is supposed to be in stock on September 13th, but YouTube user ThatNikonGuy (kind of ironic) already got his hands on one and did a comparison review between the new 24-70 and the old 24-70.
Some interesting notes:
- A difference in focal length at 70mm between the first and second generations
- 82mm filter thread on the front vs the 77mm on the first generation
- The new lens is slightly shorter and lighter than the original
You can pre order it now at B&H.