Not sure if anybody posted this, but Engadget got a hold of a Japanese Vita and did a review on the hardware.
For people wondering about the battery life:
If the Vita had us worried about anything, it was reports of a lightweight battery. Three hours? That's on par with the 3DS, which didn't earn any points in the power department either. Like the PSP Go, there's no removable battery, so how does it cope? Were we going to be forever tethered to the AC socket? We tried several different run-down tests the get to the bottom of this. On an all-out gaming test, it looks like the rumors were right - you're looking at around three hours of playtime. It took us around an hour and a half to recharge from zero to full, during continued use. That aside, you'll be wanting to take some sort of power cable with you. USB recharging is possible, but boy, it's slow.
In more casual use, with a smattering of half-hour gaming sessions, some Twitter, video and music, this stretched out to around five hours, but it's very much dependent on use. Near, the Vita's location-based social network seems to assist in bringing the battery to an early demise. We were unable to get the DoCoMo-connected Japanese variant to connect with our own SIM cards, but we'd imagine 3G use would be even more taxing on the battery. It's hard not to take issue with the Vita's longevity, or lack of. Would it have been too hard for Sony to bulk up the proportions of its latest handheld to offer us a more substantial battery life?