To answer my own question, the port pictured in my original post is not for a brake controller. However, there is a pre-wired port for this purpose in the 2014 QX80. It is located behind the dash kick plate above and to the right of the brake pedal. It is securely taped to a wiring harness. Just snip the black electrical tape (helps if you are a contortionist) and the brake controller wire can be pulled down and connected to Tekonsha plug-in wiring adapter 3050-P.
Last edited by QXTrailer; 11-30-2013 at 10:35 AM.
Reason: trying to make it clearer and post a picture