Out of curiosity, why do they not just stick with the current 787/350 (very good) reverse herringbone into the 777? I can't help but feel that if it ain't broke, don't fix it. IMO it will be hard to come up with a better design than the current 350 seat.
Has there been any clues as to the layout at all? I would imagine the only seat that comes close to being an improvement is the JL J seat, I believe Oman Air have it as well. Or are we talking about a completely new design?
On another note, I will miss the 777 J seat, some of my best plane sleeps have come on those seats, and they are second to none when you have nobody beside you.