A new lens featuring focal length of 70-400mm is circulating around the net. The focal length of the 70-400mm F4-5.6 G SSM is equilevant to 105-600mm on a APS-C image sensor camera such as Sony Alpha A700. It weights at 1.5kg.
Sony SAL70400G: Lens Look
This lens shall be a good travel telephoto lens and is good for shooting in the zoo or bird park. We shall awaits its official announcement should it is true.