Apple just released iOS 4.1 Beta 2 to developers, and unless you’re a dev, you have completely no business downloading and installing it in your i-Phone.Should you do, make sure you do not care about future jailbreaks and unlocks since you may shed your capability to accomplish it.
There doesn’t seem to be a lot in this beta release except for your proximity sensor fix, which hopefully will prevent individuals affected from randomly hanging up on men and women.