A few thoughts...
1) Since OP is receiving the 'free' DDP... there was no charge for having added the plan, so this is not a case of being charged for something that will not be received. That makes it a bit different than having an additional, unexpected charge added on after booking at an agreed upon rate. The price paid for their vacation package has not changed.
2) The OP will not fail to receive anything that was stated to be part of their MYW package, and in the terms for the 2008 DDP plan (which were available for their review prior to booking). It is my understanding that the incorrect (2007) pamphlet was mailed out after their reservation was made. They booked with the 2008 DDP, and that is what they will receive... so I honestly do not see this as being a 'bait & switch'.
3) The pamphlet in question, as confirmed by several posters, bears the 07 date on it. So the terms would have been applicable to the 2007 DDP--not the 2008 DDP. Unfortunate, and potentially confusing? Yes. But accidentally receiving an old, 2007 pamphlet in the mail does not change the terms of the 2008 plan, nor the fact that the 2008 DDP is what people have booked.
4) If I were a manager at a WDW restaurant, and someone showed me a 2007 DDP pamphlet and expected those terms to be honored in 2008, I'd probably be inclined to go get them a copy of the current 2008 DDP terms and point out the differences. Hey, if anyone feels entitled to something that is not a part of the current DDP, and wants to ask for free appies... go right ahead. But honestly, I don't see how having a 2007 pamphlet in hand makes one entitled to anything more than the actual terms of the 2008 DDP which one has booked.
It is a shame that somehow some of the old, 2007 pamphlets found their way into recent mailings. And I can certainly understand where some people--those who may fail to read the fine print, or research what they are actually purchasing--might be confused by them. But that does not change the terms of the 2008 DDP, which are clearly published numerous places. Until & unless WDW announces changes to their current DDP, I wouldn't expect to receive any 'extras' beyond what the actual 2008 DDP includes.
Now if WDW would decide to add back in the free appies and gratuities to the DDP for 2009... I for one would not have a problem with that! I might even seriously consider booking a package w. DDP, if the price were right.