We had a deposit with a dealer who special-ordered an Odyssey for us (they didn't have anything coming in that matched what we wanted). While we were waiting another dealer called us and had one in stock, so we bought it from them.
To make sure I didn't have a hard time getting our deposit back, I told the first dealer that they were getting ready to lay off a bunch of people at our company, and so we decided not to get the van right now (which eerily came true a couple weeks later, BTW). Anyway, they first asked me if it would help if they dropped the price! That blew me away - I didn't ask how much because I knew if I showed any interest they would hammer me to try and keep the deal, but I would really like to have known how far they would go.
As for resale value - it always hurts when a new model comes out, especially when there is a redesign or in this case, a "freshening". I don't think it will impact the Odyssey too bad, because they are still scarce. And, unless the price increase is huge, there will be a lot of demand for the new vans, so they will be scarce and more people will be willing to "compromise" on an older model. Of course, this doesn't matter for us. We're driving ours into the ground. I really want this to be the last minivan I have to buy, but our kids are only 1 and 4, so we'll see.