He's a new character, well according to the guy who posted the 2nd image on grandchase.info.
KoG have NEVER hyped up a boss/monster with things like silhouettes, if they want to hype up a boss/dungeon/monster they just give you the complete image straight away.
Path of Exile Ambush League - Lvl 93 Ball Lightning Witch - zKenzorz
League of Legends (EU WEST)[Active] - Kenzorz
NA GrandChase - Kenzor