Quinzel has announced that Sword 2 will be releasing Revelations patch (v6.7) in July 2011, but not this week according to Raiden here. World-Cross PvP will be included in a beta state. See also Sword 2: Revelations introduction on the official website.
Since this patch will update from v5.0 to v6.7, you may see GE-SG Update v6.3 and GE Singapore v6.7.1 for more details on new patch features. See also Book of Fire: Patch Notes for compiled patch notes from Korean test servers.
Update: Well, we won't be getting World-Cross PvP after all. But good try, G1! Thanks to Garmar of Orpesia for notifying about this new update.