I went ahead and did a graph looking at Mike Leake's fastball velocity in each start. They are in chronological order. In each start we can see that as the game goes along, Leake gets more zip on his fastball.
Perhaps we aren't seeing more 92-93-94's because Leake simply isn't going long enough in the games yet? Of course maybe he just doesn't go there often too. We don't really know yet. I do like that that he is gaining velocity as the innings go on.