I just got an email from Nikon Rumors that the Tamron 150-600 VC will sold for $1069 in USA.
Below is the email as received:
Price of the new Tamron SP 150-600mm F/5-6.3 Di VC USD lens: $1069 *UPDATED*
Posted: 13 Dec 2013 09:08 AM PST
Today Tamron announced the price and availability of their new SP 150-600mm F/5-6.3 Di VC USD (model A011) lens. The price in Japan will be ¥140,000 (around $1,350). The Canon version will start shipping on December 19th, the Nikon version will follow at a later date. Few pictures of the lens can be found here. Sample images taken with the lens can be found here and here.
Update #1: the US press release is now up and the release date is listed as January 17, 2014.
Update #2: the US price will be $1069.