I just got a call from a Disney rep a few minutes ago... she informed me they will only be honoring the first night of the reservations, the remaining nights will be charged the normal FL resident rate... she said this decision came from "upper management"... it's too bad, but I really expected it
I didn't even bother arguing the issue and told her to just go ahead and cancel our ressies...
I'm not familiar with FL law, but I am an attorney in MI and believe FL contract law is probably pretty much the same as MI... while it may be a breach of contract for WDW to not honor the rate, since they are now stating their non-performance, the only recourse to force them to perform would be to bring them to court - which wouldn't be worthwhile or cost effective for anybody. Unless they can be convinced to perform for the sake of good customer service, there's not too much anyone can do - short of taking them to court. And while most contract issues are resolved by reviewing the actual written contract terms, there is still an implied "good faith" in dealing and Disney does have a valid defense to their non-performance - MISTAKE.
Not to get too technical,

, but if anyone is interested: the Uniform Commercial Code (UCC) is the legal standard by which most jurisdictions base their contract rules. Under the UCC, a valid defense to non-performance of a contract is Mistake. The defense is made even stronger if the other party was, or should have been aware of, the mistake. Since we all knew the rate was a mistake, Disney has a pretty good defense for not honoring it.
That said, I hope those that choose to argue it are successful and get their rates honored for the entire stay. Go get 'em!!