Update: Tamron US press release here.
Tamron announced (translated) the release date and price of their new superzoom: the Tamron 150-600mm F/5-6.3 Di VC. The lens is set to go on sale as pre-release in Japan on December 19, 2013 for 140.000 Yen (approx. $1300/€1000). Other countries will follow.
The Tamron 150-600mm F/5-6.3 Di VC features the nanotechnology based, eBAND coating for better optical performance. The lens has 20 elements in 13 groups. Sample pics and more information can be seen on Sun-Photo‘s site. You can get notified when it can be pre-ordered or is in stock in the USA. The product brochure is available for download as PDF.