They are supposedly unveiling a new J seat for the 777 later this year and it sounds like it won't be herringbone as AAB has mentioned that it will involve a 'double bed' as part of it.
My guess is that the new J will be similar in footprint to the current J but the seat pairs will allow for a double bed to be created when both seats are flat. Alternatively, they will only have that in the center section and then reverse herringbone seats at a sharper angle than the A350/787 on the windows, which would allow for couples to travel together and solo travelers to still be happy.