Additional versions coming in December
Sigma has announced that it has a new lens coming in November for Canon mount cameras called the 24-105 mm F4 DG OS HSM Art lens. The lens will come in December for cameras using Nikon mounts and Sigma's own lens mount. Sometime later the lens will show up for Sony DSLR digital cameras.
All of the lenses will feature Sigma Optical Stabilizer technology to reduce camera shake, except for the Sony lens. Sony cameras use in-body image stabilization and don't need the stabilization tech in the lens. It's unclear if the Sony lens will be cheaper than the $899 street price for other versions.
The lens covers a basic shooting range from light to medium tele and uses a focusing system that eliminates front lens rotation. The focusing system also enhances when stability and supports the use of circular polarizing filters.