Brief Flip through
The setting is very historically based, I've only flipped through but there no obvious diversions from history. A lot of history flavor text is in the book, outlineing the history, geography, and peoples of the Roman Empire. (Some will complain that this is stuff that could be read in history books). The book appears to offer info on playing at pretty much any point in the Roman Republic/Empire.
The book only has two maps of the setting: one of the Empire in the 3rd century and one of Ancient Italy.
All core classes are playable except Monks (and psionic characters). The book, however, does make suggestions about where certain character classes might come from. (i.e. Druids from Gaul). Some varient classes are presented--Celtic Bard, Orphic Bard, Celtic Druid. The variations are minor--some spells added/removed from spell lists, different class skills, etc.
The new class is the Gladiator. I'll have to look at this.
Notes are given for a large number of human tribes/groups/nations. PCs can be from pretty much anywhere in the Empire--info (flavor text only, and suggested classes) is given on playing Scots, Gauls, Huns, Greeks, Egyptians, Jews, and many more.
Testament and The Trojan War, related Green Ronin settings, are referenced breifly.
I haven't seen anything so far (again, brief look) that makes any fundamental changes on the magic system, or magic-using classes, which might make the game more 'historical'. I haven't seen anything that woudl prevent a wizard hurling a fireball at a legion for example (again, perhaps I haven't gotten to that). It is suggested that Wizards and Sorcerors are rare in general, and mroe comment in the East of the Empire. A number of new roman-flavored spells are presented.
A new spell like ability is presented, the Evil Eye. All characters have this ability to some degree, and it allows characters to inflict bad luck on someone.
A new character concept called Fame is introduced. Similar to an honor system at first glance. Each character has a Fame score. Basically it's a modifier that is applied to a d20 Fame check, which can be used to perform various things like Battlefield Oratory (success gives troops bonus in battle), divination, aquiring patrons, etc.
A ten-page adventure is provided.
The book does not have any famous Roman historical figures statted.