iFIxit has torn down the fourth gen iPad. You can find the complete teardown at http://macte.ch/I2NAc .
“We got our hands on the fourth generation iPad. The way we figure, the iPad 4 is kind of like a fourth book added to a trilogy: its release was a bit sudden and unexpected, but it’s part of the group nonetheless,” says Kyle of Wiens of iFixit. “This fourth iteration of the iPad shares a lot of similarities with the previous version, so instead of our traditional, exploratory teardown, we focused our efforts on spotting the differences between this generation and the last.
If you’re kicking yourself because you just bought an iPad 3, not to worry: not too much has changed in the iPad 4.
“The most striking addition to the fourth generation is the Lightning connector,” says Wiens. “The iPad 4 also features a slightly thicker, upgraded 1.2 MP FacetTme camera, and the upgraded A6X processor. Other than those differences, the iPad 4 remains the same in terms of design and repairability, earning a 2/10 on our repairability scale — the same score as the iPad 3.”