I think that the T&C forum (or indeed this one!) would have been abuzz if BA had somehow sneaked a few quid out of the biscuit tin and been down the Seattle toy shop.
The 777-300ER would mean some activity on the payscales front after all, as it would be effectively a new fleet type capacity-wise.
Naturally other places have taken BA booking those options to be a sign that WW is about to lash out on a hundred GE powered 777 and 787 frames, with a side of 748. Sheesh...it is what it is, a placeholder as there is a decent backlog on the 777 line and BA want their delivery options at their timescale and not have to sit in the queue.