Going back to some original concerns...
A lot of us were wondering how they were going to fit the LTE radio and 2050 mAH battery into the NP. Looking at Steven's post about the NP being a game changer we could be seeing one of two things...
1.) A second gen LTE radio to allow the NP and future devices be thinner and house bigger batteries. (I don't believe this to be the case)
2.) A more efficient battery or charging method such as solar charging. This feature is DEFINTELY a "game changer" and it would allow us to go much longer without plugging in and charging, and would eliminate a key complaint of android phones.
Or it could be something totally different but the second one sure seems like a possibilty since the technology is already out there and developed by Samsung.