I just done ATP written (in Dec 2015)
FAA has changed direction now, even FAA ATP.
As Gomrath said, The Question bank is not published anymore.
I asked FAA Examiner 777 guy as well he said same things.
I do believe CPL as well. am not sure Sheppard Air have FAA CPL...
Sheppard Air is the best solution for FAA ATP.
I was just stick with Sheppard Air, and scored 89%.
I got questions never seen before around 10-15 questions. (FAA ATP ATM 125 Questions now)
Especially CRM, Aerodynamics, Weather. It was tricky questions.
I hope this help as well.
Good luck