Good news out of Boeing, the 787-10 has been officially certified by the FAA. Now that Boeing has the aircraft certified they can begin delivieries of the aircraft. Expect deliveries to begin in the next month or two.
With the battery problems that affected the 787 program before a quick and clean certification was needed to recuperate some of the financial fallout from the delivery delays.
That wont happen. The 777Xs will be much newer than the 787s and the 787-10 is no where in the same field as the 777s. You cant compare a long range skinny route aircraft to s long route full route aircraft.