Apple's promised iOS4 update has been pushed out for the iPhone 4, iPhone 3GS and iPhone 3G. iOS 4.0.1 apparently "improves the formula to determine how many bars of signal strength to display," after Apple discovered they had been using the wrong calculations. Previewed earlier today in the iOS4.1 developer beta, the update is expected to make the iPhone's signal meter more accurate, but not address the hardware issue experienced by iPhone 4 owners where holding the smartphone in a certain way can significantly impair antenna performance.
Apple's solution for that remains to be seen; the company has arranged a press conference tomorrow morning at 10am PT - which we'll be liveblogging at http://live.slashgear.com/ - to discuss the iPhone 4, but given no hint as to what exactly they'll be covering. At least two analysts have suggested a hardware fix may be in the works.