they posted with crossplay that xbox and ps4 servers will have the same content, since we know 1x as fact = xbox has archer and kama,

we can then conclude 1x=1y that 1y=ps4 will then have kama and archer when crossplay hits,

we can then deduce when ps4 will get kama and archer on that same day as crossplay ; with the dev post with video that says crossplay is coming to both xbox and ps4 March 4th. Thus we can inform that March 4th PS4 and Xbox get both cross play and Archer/Kama,

*hint Xbox already has Archer and Kama they will get crossplay which inacts what the devs state that Ps4 and xbox will have the same content at crossplay meaning PS4 is definatelly getting Kama and ARcher, they waiting because they probably getting together sales kits(for Pearl Store) and screenshots and Sony pass throughs for updates so that it is timed correctly.

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source: https://www.console.playblackdesert.com/News/Detail?boardNo=3393&category=0