You might have just guessed some of the new units there!
CA will surely use anything which is historically sound. Units like Teppo Samurai and Archer/Crossbow Ashigaru are both historically accurate and excellent tactical additions.
I think that after milking the history cow as much as possible, CA will resort to some, so to say, 'twisting' like:
Heavy Cavalry Archers (more expensive and armoured mounted archers)
Light Cavalry (fast units like Yari Cavalry but using swords)
Samurai Infantry (basic katana-wielding samurai troop, fitting in unit balance between Yari Samurai and No-Dachi)
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