Tamron has developed the AF18-270mm F/3.5-6.3 Di II VC LD Aspherical (IF) MACRO (Model B003) lens, which is the first DSLR lens to offers 15X Zoom, which is 35mm28-419mm equivalent. The lens comes with the tri-axial Vibration Compensation (VC) mechanism to eliminates or substantially reduces the effects of handheld camera shake.
This new lens will be available in both Canon and Nikon mounts, but the release date is not yet announced.