This question was asked before, but it's flagged as "Answered". The answer was that the card wasn't officially released from intel yet. The status says that it has been "Launched".
If it has been "Launched" then the 7260 ac card was just released. The drivers that are available for it are for windows 8 and are only for testing. The specs claim that it's for Win7, Win8 and Linux. So is there an ETA of when the drivers will be officially released?
The launch of the Intel® Dual Band Wireless-AC 7260 is expected during this quarter of the year (Q2'13). The drivers for the compatible operating systems will be released soon; we are also expecting the release of this product and its drivers by the Original Equipment Manufacturers since this is basically an OEM product.