Victorious isn't just the core rulebook and some vague notions of inter-game compatibility. There are a number of supplements already out for the game that you can grab right now.
More Disclaimers: I bought all of these, Troll Lords did not supply any of these PDFs.
Victorious Night of the Jackals
This is a 24-page adventure from core book author Mike Stewart.
Now this is something fun. It is an introductory adventure for 4-8 characters of 1st-3rd level. Ok, the DriveThruRPG page says 2-4, but the book says 1-3. It follows directly from the adventure in the core book, Hyde and Seek, and involves none other than Professor James Moriarty. I don't want to give too many details away, but if you are a fan of the Robert Downey Jr. Sherlock Holmes movies and the League of Extraordinary Gentlemen, then this will be a fun romp.
A bit of a nitpick, the DriveThruRPG text is a bit misleading. It looks like bits of it were copy-pasted from the Victorious RPG Core page. This is just the adventure.
This is a 36-page supplement from Mike Stewart. This supplement details a number of NPC, both good (9 total) and vile (12 total). They can be used as allies, villains, or even as Player Characters. Not as interesting as the NPCs from the Core book, but then again how could they be! Couple of nitpicks here, some the characters are described as having children, though the ages of the kids and the heroes don't always work. For example one heroine, Spellbinder is described as being in her late 20s and having a 12 year old son. She is also described as having a Ph.D. Having a kid at 18 and then continuing to get a Ph.D. THEN getting sucked into the past? It is DAMN hard to work on a Ph.D. when you have kids. I know; so does the author of the book. So it struck me as odd. Make her "late 30s" or better yet "mid 40s". I know the core book talks about the slow aging effects of supermankind, so say she is in her 40s but looks younger.
Also detailed is the secret organization "Sceptre"; used to fight the enemies of Queen and Country. A prison, Darkmore Prison, is given as a place to lock up all these bad guys you catch.
Victorious Hunter & Hunter Catalogue
This is a 44-page supplement from Mike Stewart.
Now this is a fun one! Meant to be reminiscent of the old mail order catalogs of the time, this book takes its name from two of the premiere heroic NPCs of the core book. The book is full of fantastical and mundane items characters can buy, find or engineer themselves. And it is a full book.
Vital statistics are given including any bonuses it provides or damage it does (or can take) and the equally important availability (%) and price in British Pounds and American Dollars.
This is also a good book for any Victorian era game with a Steam-Punk lean to it. It makes a nice companion piece to Cubicle 7's Victoriana - Faulkner's Millinery and Miscellanea.
My only complaint here is Troll Lords really missed out on the chance to make this look like a Vicotrian era catalog, complete with vintage art. I know they were trying to maintain trade dress with the line and readability, but it would have been a lot of fun.
Buy this if you REALLY want to know how much the Nautalis would run you in Pounds Sterling.
Victorious Rules Britania, 42 pages
Victorious Manifest Destiny, 46 pages
These are "Guide" books for Great Britain and America respectively. Both come with the same city maps of London and New York in PDFs.
Rules Britania details Great Britain in the time of Victoria and her world-wide empire. The city of London is also covered in some detail.
ifest Destiny does the same for America and New York.
Both books are really pretty system neutral with a lot of background information that is great for any Victorian-era game.
Manifest Destiny edges out Rules Britania since America is often ignored in many Victorian games. Granted England is ignored in many Civil War and Western games too. One of the features I really enjoyed about Manifest Destiny were the inclusion of the New York gangs.