I would like to see a lot of dark age/early medieval

Picts
Irish

It would also be nice to see an upgrade of the Carolingian sets you produced long to your modern day standards.

As ever I would like to see proper coverage of the Byzantine Empire, particularly 11/12th century that would provide another enemy to your Normans.

Poor Jerzy used to cheer for Byzantines.

Lots of good suggestions above. As a concept, either small standalone themes, or completing / complementing ones. So:

Colonial
*Afghan / Pathan tribesmen (like the various excellent Arab boxes)

Napoleonic
* Dutch-Belgian 1815 Heavy Cavalry

Ancient
* Elamites
* Nebucadnezzar’s Babylonians, including the lighter armed Chaldeans
* Arameans / Canaanites in long fringed robes; some infantry with “girded up loins” (kilt tucked into belt to aid rapid movement)

Oooh yes! Chariot wars stuff, Caesar kinda started on that with some excellent figures and then seemed to drop out of it. Like the look of the Linear a stuff but a bit put off by the price.