It does have WPA2-Personal. When you're on the /wifi.html configuration screen, it's the "PSK" selection. I just set mine up for the first time this weekend and that's what worked for me.
A couple of caveats - Once you've set up WiFi, unplug the Ethernet connection before you try to connect to it via WiFi. Also, give it a couple of minutes to come online, it's not instantaneous.