Assassin's Creed Syndicate is now available for you to get your grubby little paws
Incidentally, that's what the DLC's called too. The Streets of London pack contains The Darwin and Dickens Conspiracy missions as well as the Runaway Train Mission, 13 new weapons, 6 pieces of gear, and 3 new outfits for Jacob and Evie. Unfortunately, none of them can make Jacob as cool as Evie was (and I'm not one to usually say this), but they're still pretty cool-looking anyway.
If you preordered the game or picked up the collector's edition of Assassin's Creed Syndicate, you may already own some of what's contained here. If you have the Season Pass, you can go ahead and grab it for free. Everyone else, pony up $6.99. You get about 45 minutes of extra game time, and it's available for PlayStation 4, Xbox One, and PC.