Apple’s iPhone 4 had been the talk of town for many months before it’s release and people were desperate to get hold of it when it got released. Unfortunately many iPhone 4 users found out that the iPhone 4 had an antenna issue which made the phone loose signals whenever the antenna band was touched.
Now the man responsible for the hardware of the iPhone 4, Mark Papermaster has left Apple. Since he wasn’t present at the Apple Media Event either its very likely he was kicked out and didn’t leave himself. Mark Papermasters has now been replaced by Bob Mansfield. ( Senior Vice President of Macintosh hardware engineering).
Although this is a wild guess, the replacement could be possibly due to the development of the rumored iPhone 5 which MIGHT be revealed at the next Apple Media event.