If Kendrick is really coming back, I can see him next to Imagine Dragons on Wednesday.
Friday is already locked by Dua Lipa.
About Thursday - Twenty One Pilots were announced as co-headliners? If so, maybe Tame Impala as second headliner for that day?
I'm big fan of Muse, but I cannot see them as co-headliners in Poland. But it would be pretty nice return to festival site, as they previously played here back in 2007.
About Sunday - that was dream lineup for 2020 (Foals-Killers-The Cure-Chem Bros). Right now only the last one is already announced. I can confirm what mln has written above - Opener director stated that The Cure's arrival was possible - regarding 2021 edition. For next year's still no idea. But personally combination of The Killers and The Cure is perfect - due to lack of rock/alternative head in current lineup.