According to Photorumors, Tamron will announce a new Tamron 35-100mm f/2.8 on February 19th. The lens will be a small, lightweight zoom, around 560g, and it will pair well with the existing Tamron 16-30mm f/2.8. You can see a mock-up above. This lens is one of the 10 lenses that Tamron plans to announce this year.
via Photorumors