I saw a BA 777-300ER climbing out of Paine shortly after noon today - I assume it was the new delivery.
The penalties and such for deferring a delivery after they start building the aircraft are pretty steep.
In the months after 9/11, United had a bunch of 777 aircraft due for delivery (I was working 777 at the time). United would take delivery - without most of the interior - then fly them straight to the desert to park until traffic recovered sufficiently that they could actually use them. At least they could save several million in short term costs by getting them without interiors...