Wizz Air
Looking at the Wizz booking engine, the Wednesday rotation begins on 15 July and carries on until the end of the summer season in late October. Currently the winter schedule is showing 2 x weekly, Mondays and Fridays.
Katowice always saw high loads with Ryanair - well into the 90s% most months but presumably the yield didn't satisfy Ryanair.
Let's hope that Wizz gets high loads with commensurate yield.