Dear all
as the config is 2-2-2 for both the old (NEV4) and new J cabin in the A332, here is a simple way to know which cabin you'll have if you fly J :
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Old NEV4 cabin : the last row is #7 (three rows in the back mini cabin) and on the left handside, the first row is #2 . The letters used for the seats are A-B / E-F / J-K.
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New J cabin : the last row is #6 (two rows in the back mini cabin) and on both sides, the first row is #1 . The letters used for the seats are A-C / D-H / J-L.
Also, I have a booking for next summer with the new config

, but I haven't seen any special logo (like Design+ for the B777 having the BEST seats) indicating the plane had the new seats. So looking at the seat map seems the only way to know at the moment.
I now just hope that there will be no equipment swap for my flight !