If you're still sticking with MMORPG The Secret World, today you get your first big batch of "free" content, previously promised as part of the monthly drops. This one is called "Unleashed", and includes new features, stories, characters, missions, Nightmare dungeons, the Marketplace, and more to the universe -- so basically, more of everything, and a few new things.
The Marketplace lets you sell, trade, and ship items to others, regardless of where they're at. Funcom says it will be an "integral part [...] of the growing economy".
Be aware of smaller changes, as well, like the new construction going on in New York, London, and Seoul, where you'll find new neighbours soon enough.
Hit the source if you want mission details and more.