one tweet managed to catch our attention and make some semblance of sense to our puny brains. Carmack expects "the Sony NGP to perform about a generation beyond smart phones with comparable specs." That should theoretically give Sony's handheld a competitive edge over the next slate of Android and iOS devices.
"Low level APIs" may enable developers to get the most out of the NGP. Essentially, low-level APIs give the developer more direct control. However, it's unclear if Carmack is speaking out of first-hand experience -- we don't see id Software/Bethesda on this list of NGP developers.