Lexar officially launched their 32GB and 64GB XQD cards at the Consumer Electronics Show. Minimum guaranteed transfer speed is 168MBs, which Lexar labels as 1100x. Along with the cards, Lexar introduced the XQD Reader, which is a USB 3.0 card reader.
At the moment, the Nikon D4 is still the only available product that uses XQD cards, though.