If D-Link didn't switch the chipset without telling anyone (they do that sometimes), it should be based on the Atheros 5416 chipset. Should work, but not in 801.11n mode. Per the man page: AR5416-class devices are capable of 802.11n operation but are supported only in legacy modes (802.11a, 11b, 11g).
It should work in any mode you want. Generally, you want to set it up in AP mode. There are a couple of howto's available here: http://doc.pfsense.org/index.php/Category:Howto