The team has not positively denied that Syracuse will be in, but the main argument against them is that we know very little about their military post-Alexander (Archimedes' death-ray does not count). Syracuse had been a major bulwark against Carthage under earlier tyrants, and the workshops of Dionysus the Elder were hubs of military innovation. However, Dionysus' son was unable to maintain power and the city was wrecked by a series of coups. It was still a regional power by EB's time-frame, but it couldn't hope to take on Carthage as an (almost) equal.
Also, the faction inclusion criteria I know are for EB1. For EB2 the team may have expanded them, or simply decided to include some factions that were tenuous by EB1 standards.
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