UPDATE 23rd Jan 2012: It seems that despite this information, Marshall did not release the Satch Sig amp at Winter NAMM 2012.. Apparently it will be out in a few months. Perhaps we should get a lucky Chicken Foot, to help speed things along.?
Satch confirms that his new signature amp WILL definately be released at NAMM. Check the video below, and watch from around 1 minute 30 seconds for the info on the Signature Amp.