My best guess is that they (Boeing) are going to go full throttle for the future advanced trainer program. (with SaaB)
Looking at the specs of what it must be able to deliver, it is going to be both an advanced trainer, and for many air forces, in time, a true replacement for current light weight frontline fighters like the A4's, F5's, MIII & 2000, F1's and even Russian made Mig 21's and for some , even a replacement (be it partially or completely) for their current F16 and F18's.