Yes,

there are sooo many topics untouched (as already mentioned), e.g.

Byzantines

Successors (but hopefully covered by Linear_A) (a lot of possible sets from all over the ancient world)

more bronze age

end of Assyrian empire (late Assyrians, Medes, neo-egyptian, Lydia etc.

Linear-A have recently updated their upcoming sets lists (normal and mini sets) - byzantines are on the way. Set #039 is Eastern Roman Empire 6th Century (so in "early period" of the byzantine empire) - Roman Infantry Set 1, and #011s Imperator Justinian & Imperatrix Theordora

Hurrah Byzantines and late Roman Empire are most welcome.

Very promising.