Why was the NGP announced so far ahead of its launch? How long does Sony expect the NGP to reign before a refresh is needed? What impact will the NGP have on Nintendo's supremacy in mobile gaming? Each of those questions has been handled by Sony Computer Entertainment's chief Kaz Hirai in a video interview you can now eyeball after the break. In case you want the textual version of his responses, Kaz says the PSP successor was unveiled early in order to allow Sony to get as many third-party developers on board as possible (which is a lot easier when you don't have to worry about them leaking your hardware to Engadget), the new mobile console's lifetime should be no less than what we've come to expect from Sony's home consoles (so at least four or five years), and Sony's weapons for attacking Nintendo's dominance will be the litany of integrated sensors and connectivity options at the NGP's disposal. Kaz is careful to note that Sony is only aiming to improve on the PSP's current install base, but we suspect Sony's unofficial ambitions are far higher than that.