The iPhone 3G S doesn't just look like its predecessor externally, the internal physical design is also nearly identical. The location of the components on the main PCB has changed, but the actual physical design is the same,
A few highlights:
- The battery is only 6% larger than that of the iPhone 3G, so increased battery performance probably comes from better hardware and software efficiency.
- There is an additional antenna connection near the dock connector. iFixit isn't sure what that's for right now, but they'll continue to investigate.
- According to the iFixit guys, the new screen does seem slightly easier to clean, thanks to its oleophobic technology.
Be sure to check out the full details at iFixit.com!