According to the article in the franchise update thread we’ll know right away that they have an advanced development trait
8. The draft is always going to be something that needs work in Madden in some way, but I’m wondering how annoying it’s going to be to have to wait to find out a player’s development trait?
You get a payoff knowing that you have someone special. You will know they have an X-Factor or Superstar ability because you will see a hidden dev ability on their player card and on the lineup screen you will see the golden background to signify that this player has an abilities dev trait. You will know immediately this will be someone that can be a game-changing player for you. This player won’t have access to his X-Factor/Superstar abilities until they reach the downs threshold.