Yes, new sets for themes with "nice tried but bad success sets" like the Indians, 'Gaelic', Huns etc. and for the since today in every sector underestimated nomads would be very good. But also what about more realistic sets about Vlad III.? Some more civil or maybe even some more mythologic? And i'm a fan of the Codex Manesse - would just be helmet-crests but maybe even nice.
Maybe my answers seem a bit desperate, it's just about the bad end of Linear-A's croudfunding - a whole elector-army, but apparently almost no one buying; one reason more why i have to alienate, which isn't easy for a lot of cultures...

I certainly would love to see some Irish, Picts or Scots done properly as these are definitely nations that looked very different to your standard Dark Age warriors and there is very little that could be converted.