Well the higher-quality screen and the added microphone are good extras, and if the 480i/Dualshock 3 support is true then its even better. But then its not a huge extra and to be honest I dont think that many will buy into it. I will of course, and it will be a day one purchase for me ( and probably for a couple of thousand more people) but in the same time Im not seeing it bumping up sales % as much as the Slim& Lite did. Also where is the big game for the launch of it? The S&L had Crisis Core and MGS: PO+ in Japan, and arguably Syphon Filter: Logans Shadow ( coming rougly a month later) for the US, but this one will have in best case Loco Roco 2 and again that is a game that will probably sell well, but it wont move units.
So is it a worthy upgrade? No, I have to say its not, but the added features will be great extras for the late adopters and PSP fans, and it will probably help Sony to secure this 4th quarters 3rd overall hardware position for itself.