Musketeer Miniatures who do some very nice Arabs for the early Crusades tell me that they are planning a GNW range in 28mm. The owner/designer seems very approachable - their yahoo group solicited lots of opinions about the scope of the Arab Caliphates range, positions of figures; troop types etc. If people have specific ideas about how a new GNW range should develop it might be worth joining his Yahoo group.
Curassier