Now that I understand better what you're asking for... it does already tell you who is in the huddle (ie who's participating in the next play). If you notice, on the screen that lists 1QB 3WR 1HB 1TE (or whatever order it's in), it also lists the players' numbers below each grouping. So if you know your opponent's WR #14 is a slash-type player, you can see that he is indeed on the field so you need to account for him as a possibility of being at either position.

I'm not at home so I can't give you a screenshot of what I'm talking about but the next time you play the CPU, look at that screen that lists the personnel for the offense's playcall.