FYI because it was asked earlier- yes some copies of the GM's Kit were on sale at Gen Con.
Edit: Also as an FYI, I just checked out the ebay auction and I feel obligated to let anyone looking at it know that its description of the GM Kit contents is incorrect. It does not contain 6 adventure scenarios. It contains 1 adventure and a section of GM tools. I'll leave it to FFG or someone with the product to elaborate if they so choose.

