Spring/summer 2022 will see new lay outs for KLM 777/787 aircraft due to installing new WBC and Introducing of Premium Comfort Class( W) . this will be done all together for each aircraft
the new configurations have been revealed and will be ;

789 30 C / 21 W / 48 Y / 176 M ISO CURRENTLY 30C / 28Y / 216 M SO FROM 294 SEATS DOWN TO 275
781 38 C / 28 W / 39 Y / 213 M ISO CURRENTLY 38C / 27 Y/ 279 M SO FROM 344 SEATS DOWN TO 318
773 35 C/ 24 W /56Y / 266 M ISO CURRENTLY 34 C / 40 Y/334 M SO FROM 408 SEATS DOWN TO 381
772 35C / 24 W / 54Y / 175 M ISO CURRENTLY 34 C 40 Y/ 246 M SO FROM 320 SEATS DOWN TO 288
The configuration for the 772 is not final yet !
A330 will not get new seats . Hope this info will be of use for future bookings!
Y class is economy comfort / extra leg space /recline at additional charge/ free for platinum
W Class is the new Premium product

UPDATE ;This new lay out will be implemented from summer 22 onwards with the arrival of 3 new b 787/10 and introduction of Premium Economy on all b 787/777 fleet by end 2023