I feel like Ilium will focus on the humanity of Troy, desire causing catastrophe, fate versus choice, and parallel protagonists. Let me explain.
Rather than the Greeks being the heroes and the Trojans the villains, Ilium seems deeply sympathetic towards Troy, especially Priam, Hector, Cassandra, and Paris.
Nearly every snippet centers on wanting. Priam wants to save Troy. Cassandra wants to prevent fate. Paris wants meaning and love. Hector wants honor. Menelaus wants vengeance/glory. The war itself could be framed as human desire spiraling beyond control.
“Fire” strongly implies that just because there’s a prophecy, doesn’t mean you don’t have a choice. You do have a choice, but the choice will become the prophecy. Basically every Greek tragedy.
Ilium may actually avoid a single hero and instead rotate focus between Hector, Paris, Achilles, Cassandra, Priam, and maybe Helen, which would distinguish it from more straightforward adaptations.