Electure: Sheetrock has wonderful fire resistive qualities so the majority of the framing should be in great shape. A few of the trusses may require replacement near the attic roof turbine where the fire vented. The main fire area appears to have been in a bedroom and adjoining bathroom, heat and smoke damge to the hall and adjoining rooms.
They are looking at replacing the sheetrock where necessary, electrical may need replacement in the immediate fire area room and up in the attic, maybe some plumbing vents in the attic and new mechanical ducting if other than the old metal ducts were installed. Very few of modern constructed homes sustain the kind of damage that requires demolition anymore provided the fire department has a good response time and early detection. Most of these come out better than new in many cases, the owner's always seem to slip in some additional work that they have always wanted to do above and beyond the fire damage and the permit requirements assure that the work is done by licensed contractors in a case like this.
