Tamron is expected to release two new zoom lenses in the first quarter of 2010: 70-300 VC and 18-200.
Do not have all the details, but the two new products will probably be replacements of the current Tamron AF 18-200mm F/3.5-6.3 XR Di-II LD Aspherical (IF) Macro (released 2005) and AF 70-300mm f/4.0-5.6 Di LD Macro Zoom (released 2006) lenses.