
Steve Jobs has promised that the upgrade will fix several flaws in the current software, including the iPhone 4 proximity sensor problem. At the moment, putting the phone to your ear in a call can trigger keypresses because the keypad fails to disable.
Other features of iOS4.1 are Apple's community Games Centre and HDR photo-taking, which promises better quality pictures.
TV show video rental should be added, as well as HD video uploading via WiFi.
It will also include a new way of measuring phone signal strength, but it won't fix the antennagate problem - that's hardware.
If Apple follows its previous software release timetable, iOS4.1 should be available through iTunes from fairly soon after 6pm UK time.
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