...My guess is that it will go like this:
1) Open with stats on how well iPhone4 is selling (1.7M units etc).
2) Possibly a quick update on white ones (i.e. "will be coming soon").
3) Possibly a quick update on roll out to other countries incl Canada (again probably "will be soon").
4) Some
downplaying of the reception issue:
- "Most owners are not complaining about issues"
- "The media and tech forums are blowing this out of proportion"
- "All phones suffer from the same issue"
- "CR rated the phone as best in class in other areas" (Though I'm not entirely sure they'll want to specifically address any specific sources including CR)
- "It's mostly due to software and the bar display algorithm which is fixable"
5) Announcement of iOS4.1: displays number of bars better and has a whole bunch of other tweaks and enhancements.
6) And "one more thing" - facetime now works over 3G - yah!! (OK, going out on a bit of a limb on this one

)
End of story. I can't see them admitting defeat and saying that there is an actual problem. Nor really helping the owners out in anyway. If they do (which I doubt) I'm guessing it will be a simple price reduction on the bumpers they sell. Something like a reduction from $30 to $25.
There won't be a hardware fix until iPhone5.