Based on the film trailer for the experience, you'll be using the reduced DS display as both a course and gap map (one that will move dynamically once you hit your ball). More FUT 16 Coins importantly, the touchscreen technology will also be used as your method for swatting the football. The move mechanic seems to be more straightforwad than Tiger's.
There does not seem to be an precise power gauge to speak of, though there were a few lines of horizontal type on the reduced display that could possibly indicate the capability of FIFA 16 Coins your shot. For example, the further "back" you begin your heart stroke, the more power you'll put behind it. Secondly, as you attract your move, a little blue variety appears, searching out exactly how "straight" you technique the football.
Presumably, you'll be able to reduce or attract your football by modifying the bend of your drawn heart stroke. However, that isn't necessarily apparent in the film trailer.