Did it today. Took some effort. The biggest problem was not knowing whether it was jail broken since the latest season pass does not make the main menu look different. I did manage to ssh xbmc and nitto tv into it, so that's when I knew it was jail broken.
Not too sure whether they are useful or not, but I am still in the first day of it.
If you can use terminal to ssh into the device, then it was jail broken.