Some (older) infos about Slitherixeod's new Archon engine:
http://www.matrixgames.com/forums/tm.as ... n�
Apparently it can be used for both, area and hex based games. So, it's up to the game developers to choose.
Hm, but also Nations can only have 1 GHQ, and some have none, so there is actually less of a command chain than in any previous game.