A Development Diary was released yesterday outlining the upcoming zone "Papaya Island", and also mentioning that the level cap will be increased to 70 in an upcoming patch.
Papaya Island Development Diary
The development diary contains a map of the new zone, as well as some screenshots of the terrain and of its inhabitants. The Diary also seems to mention that the zone is only available to characters level 60 and above, and can be traveled to with the help of an NPC near
this location.
Hot Summer Festa
The release of the update outlined in the development diary seems to be the first part of a 3 part summer event. This first event seems to begin on July 26 with the opening of the Papaya Island zone, but continues into August with what appears to be an update containing new elite monsters and then another for a new dungeon.
The second and third parts of this event currently have no details besides their titles, "핫! 썸머 이벤트" (Hot! Summer Events) and "2012 런던 이벤트" (2012 London Events).
For further information and developments concerning this series of events and updates, you should refer to
this thread in our Korean forum.