This pattern is exclusive to the Drachenwolle Anniversary KAL, and will be available to purchase in August 2013.
The sock features extensive cabling, including a patterned heel flap that requires wrong-side cables. It is also a footed pattern (right and left socks are mirror images, not identical). So, having some experience with sock knitting is helpful before jumping in.
I recommend having some stitch markers handy, especially if you work magic-loop style to knit socks. The pattern is written for DPNs, but is easily adaptable with the proper application of stitch markers. A cable needle may also come in handy, but all of these cables can be accomplished without one, if you prefer.