Almost rolled out a dozen NUCs into our business but some minor niggly issues aside (the machine wakes itself up from sleep, amongst other quirks), the wireless issue has prevented me from doing so. Alas, I'm with DexSouth on this matter.
Heading the IT department for an employer, the wireless card by Intel is dismally, woefully, lacking in support. Joe and others here have replied in (often) timely fashion, but the drivers are and have been continuously buggy.
The one NUC machine that our business currently has (deployed in a live setting as a trial) is having serious throughput issues. Curiously enough, from this afternoon the wireless card is being 'stopped' by Windows whenever I wake the NUC up from sleep (it wasn't doing this before). Need to disable and reenable to get the card up and running again, assuming throughput variances are low enough for it to be usable without an OS reboot. Even more curious, I noticed today that my USB mouse is being turned on despite the NUC being 'asleep'. Potentially both are related because both instances started happening today, but completely out-of-the-blue either way. Might even consider reinstalling the OS at this rate but I'm not impressed with how everything is starting to hit the fan.
As above, using the latest drivers and BIOS versions as suggested by Intel. Funny thing is, when I first bought the NUC, the drivers during the early May period were perfectly fine (wireless, BIOS, and graphics more specifically). If I do do an OS reinstall chances are I'll use those older drivers I've stored in the business repository rather than use the newer so-called 'less-buggy' drivers Intel's been putting out.
Now. As it stands I'm getting an Asus N10 USB wireless dongles from a local IT store for less than US$10 a pop and will be making-do with that. Intel, understand that the continued issue with the 7260 series cards is completely unacceptable. This isn't an issue with a 'select few'. It is widespread and I'm quite surprised that there hasn't been legal action considering some OEMs themselves are having problems.