如果说ios5的改进就这些的话，苹果你就太坑爹了

引用:

Interestingly, a partial glimpse of the iOS build number can be seen as the "About" screen is shown, and the device appears to be running iOS 4.0 with a build number beginning with 8A as would be expected. Consequently, this does appear to be a test version of iOS 4.0 rather than an upcoming iOS 5 build, although Apple could of course choose to implement some of these features in future iOS releases.

The device also appears to contain several preloaded applications internally used by Apple for diagnostics, testing, and demoing, lending additional legitimacy to the claims.

Update: Noted jailbreaker/hacker @chronic reports that the build is indeed iOS 4.0 8A216. The public release of iOS 4.0 was build 8A293.