ArcheAge is a medieval fantasy massively multiplayer online role-playing game (MMORPG) in development by Korean game developer XL Games.
The developers promise a community like that of Ultima Online, PvE comparable to World of Warcraft and PvP taken from Lineage 2. The game itself is developed as a “sandbox” – where the player is completely free to chose what to do and how to live.
Huge world map
Mass PvP (100+ people)
Crafting & production
Mounts (eg. horses)
The lead developer for ArcheAge is Jake Song, the guy behind games like Lineage, Tabula Rasa and Aion.
ArcheAge also has insanely beautiful graphics and will run on CryEngine 3: you can see a short showcase of the engine in ArcheAge in the video below (about 2 minute mark):
You can find out a bit more about the game from the official website, ArcheAge.com.