From Tamron:
February 22, 2013, Saitama, Japan - Tamron Co., Ltd. (President and CEO: Morio Ono / Headquarters: Saitama City), a leading manufacturer of optical equipment, announced the launch of a next generation 90mm Macro lens for full-size SLR cameras. The lens features completely redesigned optics, a proprietary VC (Vibration Compensation)*1, and USD (Ultrasonic Silent Drive)*2.
The SP 90mm F/2.8 Di MACRO 1:1 VC USD (Model F004) for Nikon will be first released in Japan on March 2, 2013 and subsequently elsewhere.
(*1) VC (Vibration Compensation) is Tamron's proprietary image stabilization mechanism.
(*2) USD (Ultrasonic Silent Drive) is Tamron's proprietary ultrasonic motor drive.
B&H has the Tamron SP 90mm F/2.8 Di MACRO 1:1 VC USD Lens for Nikon available for preorder.