Some coverage at IG: http://www.industrygamers.com/news/john-carmack-says-ngp-is-a-generation-beyond-smartphones/
Basic info courtesy IG at http://www.industrygamers.com/news/sony-reveals-its-next-generation-portable/:
My take is that this could potentially be the portable hi-def gaming system I've been waiting for due to the processing power and the dual analog sticks that makes console style action and shooter games realistically playable. I never liked SOCOM etc on the original PSP, and the virtual shooter controls on iPhones is totally meh. The price may be an issue since many are speculating that it will be at least $299 which is a lot for a handheld...but imagine being able to play games like Uncharted wherever you want? Definitely something to think about despite that this system is unproven as of yet. And there are other issues around software cost for portable games, actual battery life, how rugged/durable it will actually be, will the optional 3G be worth it or even effective and etc.