They do receive a speed boost, look at the coach cam. The speed values don't match up with what is shown on the depth chart. Example, Terence Newman - 85 spd vs Mike Evans - 87 spd but is some how +5 on the coach cam but on all-pro he's only at +3. I'm pretty sure the speed rating on coach cam is the average of the players speed and acceleration, that's why Evans is at +3 instead of +2 on all-pro, 87+90/2=88.5 dropping the remainder. From what i can tell all-madden gives +3 to speed for the CPU, no increase to acceleration.