An Occultus Faction possibly worked out?

[Gaius Sempronius Gracchus]

I seem to remember that the EB2 team, early on, said that there was room for 10 new factions. We know of 5 of them (Pergamon, Bosphoran Kingdom, Massylia, Boii and the Lugiones) so....thinking about the map, where might the other factions be? Well, I think it is almost certain that one of the Celtiberian groups is going to be in (Arevaci?), I would put money on there being a Belgic faction in some form. Who else? The Nabatu have got to be in with a shout. That leaves two more....

Media Atropatene? Remained (as far as I can figure) independent and active - politically and militarily - for the greater part of EB2's timeframe.
Galatia? Perhaps too many factions in such a small area, but then....., perhaps because of all those other powers Galatia might only be able to survive as a faction, rather than as an Eleutheroi province.
Sequani? Perhaps a bit too much for the area but....in alliance with the Helvetii might provide a little more intrigue into Gaul/Germania.
Scordisci? Maybe just a little more pressure in that are of the map, to stop the Epirotes/Makedons from spreading too rapidly North, or the Getai taking too much Westward too easily.
Skythia? I know, a weak one this but you never know - the Hellenised Kingdom was active and expansionist...

Just throwing a few ideas out, and putting forward that beyond the (expected) Celtiberian, Belgae and Nabatu factions, the remainder (two factions) are difficult to guess.