Sevencore for a while now. Fortunately we're about to get our hands on it too, thanks to the impending closed beta.
Korean free-to-play fantasy imports aren't exactly scarce these days, but this one adds a dash of sci-fi and some nifty mount mechanics into the usual MMO mix. Players can battle across land, sea, and sky as well as fight from the backs of dragons, hover-bikes, and more. Sevencore mounts can also be trained to fight beside their player masters, which makes them more than your typical MMO beasts-of-burden.
gPotato has opened up beta registration as of today, so head to the official site and sign on if you'd like a shot at testing on August 9th. Sevencore features three classes (Warrior, Magician, and Gunner), plenty of PvE, and PvP in the form of guild battles called Occupation Wars. gPotato intends for Occupation Wars to be a persistent territory control mechanic, as the victors will set tax rates and item prices for players who enter a region under their dominion.
[Source: gPotato press release]