It looks like an upcoming battle pass has been accidentally revealed for Lost Ark, via a recently released PvP video on the official Youtube channel for the game. This feature, which is present in the Korean version of the game, has not yet been officially announced nor teased by Amazon Studios.
Spotted by Lost Ark forum user Canary, a symbol for the Lost Ark battle pass - named the Ark Pass - can be seen right above the Welcome Challenge icon near the mini-map in the top right corner of the screen.
The video also shows off several different players with class icons displayed in a PvP menu too, including some classes that aren’t in the western version of the game yet including the Reaper and Glavier. As such, if we assume that this is a super early version of the western version a decent amount of upcoming game updates may have been revealed accidentally.