As reported over at Lineage II Center, they gave news that they are raising the level cap from 70 to 75. This news was originally posted on the Official Korean L2 BBS days ago, and can be found here.

This change is apparently due because of two players [Akiras and Dwarf King] that are currently level 69 but will reach the current level cap of 70 within a month. Thanks to Nanos Eversoris from our forums for letting us know about this information!