These really are some beautiful sets for at least a scifi/fantasy game market - especially those Hoplites and Ancients, but posing aside the Trench Raider figures as well would work equally well for sci-fi and fantasy, as the only thing that screams "20th century" are the helmets and weapons: head and arm swaps are easy for anyone who has been around these kits long enough to amass bitz boxes, and they could kitbash nicely against leftover bits from, say, a box of Conquistadors or later Romans. I could see the Trench Raider torsos appearing anywhere from historical battlefields from perhaps the Renaissance or even Dark Ages up to WWI, and from post-Apocalyptic scifi to, as @Paul Mitting suggested, pulp-scifi ala Flash Gordon, and they easily drop into the D&D fantasy kitchen sink without looking out of place for bandits or town guards or an evil warlord's elite warriors... it's a great canvas for scifi and fantasy ideas, whatever else it works for!
Absolutely agree that the Hoplites make better Amazons than the Amazons do - well done on those, the poses, costumes, the works are just gorgeous work, WGA's sculptors etc. outdid themselves on this one.
And then there's those ancients - fantasy cavemen? Sea people? Mongols? Barbarians of all sorts from fantasy to a Roman setting? Post-apocalyptic bombed-back-to-the-stone-age types? Even if we just limit ourselves to historical subjects, I could see these guys in a varity of ancient and classical settings from across Europe and Asia, at the very least.
Also recently released for digital have been some great gladiators and Landsknecht - both also fine for fantasy subjects and workable for pulp sci-fi and Deathfields as well with a little creativity and a few sci-fi bitz - some nice Mississippean natives that seem pretty flexible for other uses, a Russian Women set and a Polish Women set that both look great for early 20th Century subjects and for Death Fields and pulp sci-fi, a Roman Legion swords-and-spears upgrade bitz set which might go nicely with either those ancients or the Trench Raiders for quick-and-dirty fantasy warriors, some specifically Amazon warriors that are maybe not quite as good as the Hoplites but are still pretty good, some Shield Maidens, some female African warriors, some Japanese Renaissance warriors, some German Treasure Hunters and Thuggee Assassins a-la Indiana Jones, some Viking Berserkers, some Cthulhu Cultists, Aztec Cultists, and "regular" Fantasy Cultists along with some great historical Priests of various sorts, some Maoris and some Jewish Revolt ancients, some Ogres and Ogre skeletons, and a great Dark Ages bridge battle set:

All of this stuff is great for fantasy, sci-fi, and in some cases both - WGA has been VERY busy lately, even if it might not seem that way based on the frequency of plastic releases. I really REALLY can't wait to see what's in store for the plastics, and I definitely hope to see lots of the digital stuff realized in plastic!