@Karol Siadul I honestly hope WA doesn't go down that route. It's annoying enough to see Warlord so obsessed with Bolt Action that it neglects their (far more interesting in my view) Ancients and Dark Ages ranges, it would be a tragedy and waste of potential for WA to follow them in those footsteps. There are so many Ancient factions that haven't had any decent plastics made for them, compared to the main WWII factions for example which already have very popular Bolt Action plastic boxes that it would be a waste of time and talent for WA to mimic when they can capitalise on niches that Warlord have ignored. The same goes for Napoleonics, Warlord have once again been on the ball with Napoleonic plastics by and large and it would be pointless for WA to try and create their own versions of the same kits.
Anything Bronze Age would be marvellous - I've already advocated my support for Trojan War box sets, plus I'd like to see Assyrians, Hittites, Sea Peoples, hell even a combi-box for Bronze Age Britons/Germans/Gauls/Northern Europeans in general if WA want a real challenge. Chariots would in particular be a big seller as I imagine they could become a faff to build in metal.
With regards to Iron Age, Romans and Greeks have been done to death (though plastic Greek Artillery would defintely be another niche ticked off the list, as the only plastic artillery Warlord have done thus far has been for the Romans, and just the Scorpion), Victrix have gone all into Persians but as WA already have some Persian Infantry of their own it wouldn't hurt to make some chariots and cavalry, and I agree with one of the posts above that Ancient Indians would be excellent and certainly haven't been done before in plastic.
And I'm sure this is just the tip of the iceberg, there is so much WA could make in this period that it would be criminal if they left the First Empires line in the dust in favour of World Ablaze and Napoleon's Wars.