When we bought last year, we looked at 2017 Odyssey right around when the 2018 were coming out with a significantly different design.
While we got some off sticker price, the dealer had already discounted off sticker price when we approached them. We looked at two different Odysseys at two different dealers. Neither dealer would go down much from their initial (published) offer. I mean, maybe we are lousy negotiators and they called our bluff, but we after a few small price drops, both dealers came back with "this is what it is buy it or buy the other one at the other dealer you are talking about."
We did get a better "deal" offered on the upgraded model, but in the end went with the less expensive vehicle as we decided we didn't "need" all those features.