To my great delight I stumbled upon the following documentary on Dutch TV last night:
http://www.nederland3.nl/gemist/8930 (the part about the A's starts at 6:20 and fortunately for you guys, it's mostly in English)
Though it is centered around the use of statistics in soccer, the part about the A's is really interesting, as Beane seems to suggest that the statistics that are currently used within Baseball and within the A's organization are way more advanced than 8 years ago. Baseball analytics have evolved to something that is not dissimilar from quant research at hedgefunds. It would be nice to hear a bit more about some general directions, notions and ideas, but that was unfortunately not the idea of this documentary.
What it suggests to me is that when people here are being negative about Trevor Cahill, Conor Jackson, trading Rajai Davis and other moves, there might be more advanced stats and better evaluations than the "simple" xFIP, tERA, UZR, wOBA numbers suggest.