The EF 24-70mm f/4L IS USM lens is a new lens announced last November, 2012. This is first time price drop on this lens.
EF 24-70 f/4L is the first 24-70mm lenses has image-stabilized features. You can see 24-70mm f/4L IS sample images.
Get this lens for $1,419.00 ($80 off) at B&H