Consolidating what we've learned here and via BASource re which planes have/don't have new WT+... if the mods would like to make this a wiki for the thread, so others can edit for more detail, mistakes, changes etc, that might be a good idea?
A380 14F/97J/55W/303Y
YES
B747-400 14F/52J/36W/235Y
NO
B747-400 14F/86J/30W/145Y
YES
B777-200 17F/48J/24W/127Y
YES
B777-200ER 40J/24W/219Y
NO
B777-200ER 48J/24W/203Y
NO
B777-200ER 12F/48J/32W/127Y
NO
B777-200ER 14F/48J/40W/124Y
YES
B777-200ER 14F/48J/40W/124Y LGW
NO
B777-300ER 14F/56J/44W/183Y
YES
B787-8 35J/25W/154Y
YES
B787-9 8F/42J/39W/127Y
YES