In UI KF2 assets you can find UI_MapImages_TEX.upk package. It has preview pictures of maps that was planned to release early. You may find something interesting details here. Check out each one:

• On BioticsLab preview it can be found only new Horzine logo
• On Manor, OperaHouse and ParisBurning pictures you may see parts of released map BurningParis. It seems like dev plan to release 3 maps but then they just compile 3 maps into 1.
• On Resort preview you may see map in deleloping even without some textures so It’s hard to say what map is this. I guess it becomes EvacuationPoint map
• Last picture named Village represents castle wallls completely with no textures. May be it becomes VolterManor map