Pre-PMA 2008: Sigma has announced an optically stabilized 120-400mm f/4.5-5.6 lens. The lens will be available for owners of Sigma, Canon, Nikon, Pentax and Sony DSLRs. A maximum magnification of 1:4.2 also makes it useful for users who want to get a little closer. The DG designation means the lens will work equally happily on 35mm or APS format SLRs.

Source: News: Digital Photography Review (dpreview.com)