That jRO page indicates these are upcoming content for Q1 2015 and beyond. It advertises Tower of Genie, another time-traveling instance to reconstruct an epic battle, the new year's event, etc., and then goes on to mention the "Second Costume" System they are working on, and that all the designs are in development still.
That said, kRO *did* just add some stuff to the client recently for "styling" your characters...
(Also I love *most* of the new sprites and would take them in a heartbeat over the originals. A few I wouldn't though, like the, Bishiop, Sorcerer or Rune Knight. Rest are super awesome, like the Wanderer one <3<3<3, ranger, and GX).
Costumes on top of Costumes? They might as well give us slotted costumes so we can wear x2 taos and cover it up with a 3rd costume tab.