Tamron recently announced the very attractive SP 24-70mm f/2.8 Di VC USD G2 lens. It is available in Canon and Nikon mounts and comes in substantially cheaper (at just $1,199) than the first-party options from both manufacturers.
The $1,199 price point would be attractive for a plain 24-70mm f/2.8 iteration; however, the inclusion of Tamron’s Vibration Compensation makes this lens especially enticing. It has a 9-blade diaphragm and Tamron claims a somewhat suspect 5-stops of camera shake reduction. While I have no doubt Tamron’s lens stabilization will perform well (and it is very welcomed on this lens), 5-stops of shake reduction would be an impressive feat.
Nonetheless, the Tamron SP 24-70mm f/2.8 Di VC USD G2 lens ships in August for the Nikon mount. Canon shooters will have to wait until September to get theirs. You can pre-order it now here at B&H Photo.