It still says 777 in MMB but my boarding pass says world traveller plus seat 12G and there are no configurations of the 777 (per basource) that have a row 12 in WT+ except for the version that has no F but there is definitely F on this flight. That's why I was hoping to find out exactly which plane it was going to be so I could check. I suppose I will just have to be patient for now!