I think that Garmin has a lot of Lifetime Contracts for NT Maps in Europe,
They also have a lot of Lifetime Contracts for NTU Maps in Europe, NTU is needed for Special Character Sets in Some European Countries.
That is why they need to Release 2 Maps for Europe.
The Americas North and South will probably stay on NT, English, French,Spanish and Portuguese.
Some Countries in North Africa need NTU, That is why Pan Africa NTU has already been released.
In Theory, By just modifying the Firmware any Garmin Device new or old could be modified to use NTU Map. !
This seems to be the case of the Nuvi 250W reported by CatyMag.