Apparently, this was an offer that was made to wdw guests from the end of last year through about March. If you made a new reservation while you were there or had an existing reservation later in the year you would get a discount.
I read about this on another board, and I wrote to guest services on behalf of my Mother who was there in February and had another reservation for December, she never received this offer while she was there.
About a week after my e-mail, she receved a call from Guest Services and was able to move from POR to WL at a great rate (I believe it was 8 nights for $1199).
If you had a reservation at the time of your last trip, you can try contacting them. I wrote a very polite e-mail, with no demands or threats in it. I simply asked why the offer had not been extended to her.
They did take the time to check that she had the December reservation in February and they also looked at her history (6 visits in the last couple of years, all POR). And the CM that called was just wonderful to her.