Buy now or wait for 2025 models?

I was about to get a 2024 Denali. Dealer has it with reserve package for about 71,500 from almost 80k sticker. I can also get the Costco 1000 extra off if it isn’t expired. They’re pressuring to buy now, of course, and said they aren’t getting anymore 2024s in. They said anything new coming in would be 2025 and will cost more. They also said the new ones will have minor changes such as headlights and taillights, which for me sound like a pretty important change. Do you think it would be best to buy now or are they just trying to make a quick sale? I’m not in a rush, but want to get the best deal possible and would hate to miss out on the current discounts. Also, you think they’re really changing the lights?