Sigma 120-300 f/2.8 DG OS HSM lens and USB dock were delayed due to sourcing parts for the new lens. It was originally scheduled for a March release, now this Sigma zoom lens scheduled to be shipping in May 2013.
According to B&H Photo Sigma 120-300 f/2.8 DG OS HSM lens will be in stock and available on May 15, 2013. The price for the lens is $3,599. You can pre-order through the links below.
Sigma 120-300 f/2.8 DG OS HSM Lens Shipping in May
|B&H Photo Video
The Sigma USB dock enables users to easily update lens firmware and fine-tune focus parameters.This product will be available at the start of May for Sigma and Canon mount. The price for the Sigma Usb Dock is £39.99 in UK including VAT.