AppleCare has confirmed what we already knew: The incoming software update won't fix the iPhone 4's transmission and reception problems. They acknowledged the antenna problem exists, offering the same solution as before: Buy a case or hold the iPhone differently.
http://gizmodo.com/5580587/applecare-the-iphone-4-update-wont-solve-the-antenna-problem
http://gizmodo.com/5580587/applecare-the-iphone-4-update-wont-solve-the-antenna-problem