As mentioned in last year's manual, the carpet is:
"Shaw Floors, Philadelphia
Commercial, Neyland II, 20, 30550, “Ground Pepper”".
The carpet for 2012 was a slightly different color, but obviously we don't know for sure until the 2014 manual is released, but it should be the same 'pile' at least. I believe the pile of the carpet is 20 oz/sq yd, so any carpet with that should be similar, if I'm not mistaken.