Ammoland has the info:
The Desert Digital Special Edition is a matched set featuring the SIG556 ER folding stock rifle and P226 pistol in 9mm. Both rifle and pistol share unique matching serial numbers and ship in a custom tactical hard carry case by Pelican.
The set includes (1) double 30 round magazine set for the rifle and (3) 15 round magazines for the pistol. A certificate of authenticity is included. This collectors edition is limited to 1500 units total.
Pretty cool. No word on price.
More info at Ammoland.