As much as I'd love it to be D20 Modern, the book was finished quite a bit before D20 Modern was ready for the public. So it will put ideas into the modern era. It's meant to be compatible with Forbidden Kingdoms, Dungeons & Dragons, and even science fiction settings.
It will definitely include a list of media. At least, that's what I wrote, I haven't seen the final product yet. It's a fairly extensive bibliography. The bibliography matches the three eras in the book -- historical, modern, and futuristic mercenaries.
There are two new classes (Professional and Soldier of Fortune) and a bunch of new prestige classes. The prestige classes range in scope -- from historical to fantastic. They are all sharply focused on mercenaries and their application in a military setting. The prestige classes include:
Auszug (historical) - Elite polearm warriors.
Ballestriere (historical) - Crossbow specialists.
Commercialist (modern) - Jack of all trades mercenary.
Cormorant (fantasy) - Demonic mercenary who writes infernal contracts.
Condottiere (historical) - Mercenary leaders.
Ergydlym (historical) - Archer specialists.
The Forlorn (historical) - Doomed criminals wielding 2-handed swords who fight to earn their freedom.
Gaesatae (historical) - Ferocious barbarian mercenaries.
Gallowglass (historical) - Highlander mercs.
Gurkhali (modern) - Knife-wielding specialists.
Illusionary (fantasy) - Mercenary wizards who sell their illusions as mercenary armies.
Leigonnaire (modern) - The modern mercenary who would rather forget his past.
Necrenary (fantasy) - Mercenary wizards who use corpses as mercenary rmies.
Psychic Assassin (fantasy) - Hired killers who sell their powers to the highest bidder.
Specialist (futuristic) - The technological mercenary who specializes in hacking and surveillance.
Stradiot (historical) - Terrifying mounted headhunters.
Traditionalist (modern) - The cigar-chomping, gun-toting merc we all know and love.
In general, I didn't go the "blaster for hire" route. It really changes the tone of the book. I do talk about the implications, but I wanted to focus much more on tactics. You'll note the four fantasy prestige classes use subtle magic -- none of them are lobbing fireballs into opposing armies. I used The Black Company as inspiration. They had magic, they used it to even the odds, but it never overshadowed good military tactics and the need for a mercenary army.
I basically tried to get as much information about mercenaries as I could into one book. I really hope it does well.
Mike "Talien" Tresca
http://www.retromud.org/talien