He may suggest some extra things, He may not. Installing additional wiring at this time is almost always the best solution. There are things He may not think of that you can ask about. Anywhere that you may use wall or window Air Conditioners should have a separate circuit installed for that outlet. Ceiling Fans need special support and it's easier to install the supports and boxes now.
Lighting is an important consideration in any project.
Try and visualize the finished rooms and how they will be used. By the time the furniture is in the room it won't be centered over the table. These are things you should think about. If you can, you should try to place the furniture in your mind and plan your lighting accordingly. Several different types of lighting under separate controls can add great flexibility to a room for changing moods and uses.