This is what going to happen
They will say majority of the iPhone4 user don't experience the antenna issue, only a small group of people using the iphone4 in an non ideal signal location might experience signal issue and apple is working hard on a software fix to resolve the carrier low signal/coverage issue.
And no freebies, because any freebies means compensation for the faulty device, period.
And on the next conference, if the software doesn't fix the issue, apple will say they did the best they can to solve the carrier issue, but you can only do so much on to the phone side, the root cause are still the sources of the signal.
And the next thing going to happen is the launch of ipod4, ipad mini, iphone5