If you believe the info at the 787 blog, which seems pretty up to date, our 25th airplane is due to be delivered on 11/20/2015.

https://docs.google.com/spreadsheet/...=2&output=html



theoretically that could change if the deliveries were modified based on a 777-300 order, but since we are now 10 months out from that delivery, I think it is unlikely.