Wow, Moros is really helpful. i will never believe all the horrible things people were saying about him now. =)

As for the orange shaded map in the OP, I don't think another arabian faction will be included in the eastern part. They did an entire arabian preview, I'd say that would likely cover that region. Also, weren't they only going to release 7 factions for the first release? By my counting we have our 7 announced. This means (if they haven't changed policy in the intervening years) that we are more likely to see a release than a new faction next. Although that doesn't put a timeline on it. Could still be a long long way off.