And to answer, another 7 months later, since it's one of the few hits with some information if googling the card on FreeBSD, in FreeBSD-11 the 7260 works with the iwm driver. I have a yoga2 pro, and upgraded the card to a 7260 dualband and it works, but though it connects to a 5GHz access point, it seems to only use 802.11a, getting the same speeds that I got with the non-dual band card. Linux seems to do a lot better, coming close to wired speed on downloads (but my Spectrum account is supposedly only 300 Mbs and both wired and 5GHz wireless go over that).
Doing transfer between machines, it gives me the same 2-5MB/s that I get with the 2.4 GHz, whereas in Linux, it's closer to 40-50 MB/s. This holds for both FreeBSD-11 and CURRENT.
Anyway, the card does work, though not as well as it does in Linux.