I would be interested in NPCs tied to this. Instead of just using a guard statblock, I could have a basic whatever statblock that is a bit different than a guard. Granted, they will not be as detailed at the actual subclass, but it would give the DM some ideas to use it and allow the players to see something in action. Maybe one is a NPC mentor to a new PC or something. It would add to the roleplay at the table.
I would also like a bit on history of the fighter or the idea of a 0 to hero going from 1st level to 20th. The way the game is played now or the power of a 1st level PC compared to older editions. Tell us how this book fits the new game and how the powers are similar.