I have a suspicion it'll have rolled-out to only about half the targeted markets by Dec.

But by that stage, the 1st WP/s will have rolled-out to their targeted markets almost 100%.
Plus ongoing supply will be far more agressive...

The few big/influential markets the WP/s are going to, will then provide saturation air-time for the 1st WP/s.
And the N9 will fade into the back-ground, as mindshare is minimised, all by design.