Looking at my copy of the France volume (from 2011, haven't seen later ones), there is no reference to Picardie or Amiens, Nord-Pas-de-Calais or even Lille, Avesnois, Thierache, French Ardennes or much of Champagne outside of Reims (e.g. Laon). Lorraine is possibly covered (Alsace is of course), I'd need to check again. In my own experience travelling in France, these are extremely interesting areas and I'd suggest they be included in the future assuming they are still being left out.
I realize France has great riches but the north - meaning not Normandy in this case but the far northern fringe has a fascinating history, some fine architecture, great churches and museums, and excellent local food. The only drawback, for those affected by it, is the weather, but when travelling in summer, late spring or early autumn much of the inconvenient weather can be avoided.
There is much countryside in the north, Avesnois and Thierache, especially the former are green and rolling, reminiscent of Normandy.
I looked through the forums for any detailed discussion of this issue - very little. A real pity and Americans are missing out IMO by not seeing these places.