Good morning Joe
I Minervia put in work in Parthia so persians/Parthians could be an option- absolutely. Now, does that mean they will produce- I do not know- my interpretation of the information provided on the website leads me to believe that this range will begin in Dacia which will leave us with traditional "barbarian" tribes.
Comparing the Conte latest releases with the FL releases- Conte is going more for a northern look as his legionaires are wearing the feminalia undershirts and such which was adapted for colder climates (if you watch The Legion, you will see those guys wearing that sort of thing in Caladonia (Scotland)). Given that these FL figures do not appear in feminalia, allows the collector the versatility of placing them anywhere really. KC's Romans wore the feminalia as well.