I predict NX will have full 480p on Handheld and Full 1080p60fps on Home Console.

[Miyamotoo]

When we talking about handheld resolution anything from 480p to 720p is possible, but I think they will go for 540p same like Vita.
Nintendo will probably go for 1080p/60fps game for NX home console beacuse they went for 720p/60fps for Wii U.