Announced recently on both Gameforge and G4BOX official forums, G4BOX will no longer operate their metin2 us server.
All is not lost for players however, as Gameforge is stepping up and providing a new home for them. A tool will be provided that any player who wishes to transfer to Gameforge's US server must use, if they want to survive the end of G4BOX's server. Yes, from the sounds of it, the transfers are manual.
Certain item shop features for G4BOX's Metin2 server have already been disabled, and the server itself will stop operation on April 2nd. I guess ending on April 1st would just be too cruel. An earlier version of G4BOX/Z8Games' closure announcement said that both the Free Kingdom and New World Metin2 US servers would merge onto Gameforge's Metin2 US server, however this has now been retracted. As Gameforge's US offering only has one server though, this still seems like the logical conclusion.
Disparities between the servers such as differing item names will be taken over by Gameforge data. Stats and items that are unique to G4BOX's offering like vs and resist (class) stats on items, +5 spirit stones and the like are still under discussion. Refugee players will of course be able to access the new content pack.
More info is expected as the closure and moving dates draw nearer. Z8Games/G4BOX and Gameforge both have threads on their respective boards that should receive further info as the days go on - be sure to check the source links