NTT's next-generation network NGN's official name is "FLET'S Hikari Next", as of the end of March 2008

According to NTT East Japan announcement, the service brand of optical broadband service in NGN commercial service is scheduled to start from the end of March, 2008 "FLET'S Hikari Next".

Details are as below.
About the status of examination for the provision of next-generation network (NGN) commercial service

According to this release, the same fee structure as existing service. The fee level of the service for content distributors plans to be equivalent to existing service with QoS function.

Regarding area development and service start timing, we began offering in some areas (NGN field trial execution area) of each prefecture of Tokyo, Kanagawa, Chiba, Saitama at the end of March 2008. It plans to expand to cabinet-designated cities, prefectural office location-level cities by the third quarter of FY2008. Furthermore, it is planned to expand to the current B FLET'S service offering area by the end of FY 2010.

For the difference between NGN and the Internet, the following articles are easy to understand.

ITmedia Enterprise: What is next generation network NGN of "nice tokori"?

Future Navi "What is next generation network NGN?"

Will it be possible to protect the "ragged" Internet - Professor Murai of Keio University and 3 career companies discuss about NGN? Internet - latest news: IT-PLUS

Next Generation Network - Wikipedia

It is not like switching to the user at once, but it will be meaningful ... it is a feeling.