Fullback questions?

Obviously we plan to have an extremely good running attack this year, my only concern is the fullback position. We are accustomed to having very big, physical fullbacks who aren't always the most agile but are better than average at the point of attack. Do y'all think we still will rely heavily on ISO concepts and does anyone have knowledge on the kid who will start and the quality of depth at the position.

Just making small talk so don't freak out on me.