There will be nothing free offered during the press conference unless they have decided to do some type of coating, at which point you could just walk into an Apple store at your convenience and get it swapped. They will ID the problem, admit they let us down but give the excuse that they only did so by pushing technology so far ahead of everyone else, and then they will propose a remedy (most likely software). Any hardware changes will have the public up in arms because everyone will want to trade their 4 in even if they aren't having signal problems.
Then they will let us know we can pre-order the white model starting on X which will make everyone happy.
And a super long stretch, one I don't believe will happen but you never know, is info on a Verizon deal.