Here are some interesting facts about the play and, more important, the last paragraph is the response from MLB.
Dodgers turn first 2-5-6-3 triple play in history but Padres cry foul over umpire?s actions | Big League Stew - Yahoo! Sports
The ball kicks off the left side of the plate which is over fair territory. While I believe the ball is foul, it is difficult to tell if the ball rolled off the left side of the plate into foul territory inches away from the left side of the plate. Looking at the play, F2 straddles the plate and picks the ball up in front of his right foot which is over foul territory. Is this a foul ball? Perhaps an overhead view from the camera, if one exists, would be more definitive. Does anyone here think the ball is in front of the plate?