Famitsu has an article running in its latest issue polling all the big (and some smaller) Japanese developers about what they think of the NGP.
The consensus is:
Developers want to do cool things with the reverse touch screen
Price point should be around 30,000 yen ($360, £225)
NGP will be developed for alongside PS3 and Xbox, so expect all the big games
The OLED display is lovely
Some of the developer game ideas are fairly high concept, punk multyplayer, school violence etc. Only one title was mentioned by named, Genpei Toma Den, which could make use of the back screen.
You can read the full thing in English over at andriasang.com