Sigma's new dock mount provides a simple method for firmware updates as well as precise focus adjustments of multiple areas of the lens. A zoom lens will provide even more possible functionality. Take a look at the video below for full details. The dock should be available in May for the price of $59 which is well below what I expected for this amazing tool. Sigma has really been improving their lenses significantly in the last few months and our reviews of the new Sigma 35mm f/1.4 & the Sigma 30mm f/1.4 have proven to be some of the best lenses on the market and for a great price. 

Sigma Optimization Pro and USB Dock Demo from Sigma Corporation of America on Vimeo.