My wife is constantly getting flyers from GM stating that her 1998 Chevy Prism is in "high demand" and that they want to give her "top dollar" on the trade-in for a new car.
It's a complete marketing gimmick. Don't fall for this crap. All they're wanting to do is to get you thinking about a new car and try to get you to purchase from them so that they can KEEP taking your money. It's not that they have quotas to fill, or that they have a buyer already for your '03 MO, or that they just think you're a good guy and want to make you a good deal. It's just a way for them to loop in a customer easily because, after all, you already bought one so maybe you'll buy another one?
That said, if they ARE willing to give you a good deal and get you out of your lease early, AND, if that's what you're wanting to do, fine. Take it. But don't let them convince you that you're getting an extra-special deal just because it's you.
Think of it this way: You're locked into a lease right now. When that lease is up, you'll probably be looking at all kinds of different cars, Nissan or otherwise. They figure that if they give you an offer BEFORE your lease is up, and you want to get out of your lease, then they have you back in their pockets rather than losing you to Honda or Toyota or whoever.
Just be smart. Don't go into the dealership because they suckered you in, ONLY go to a dealership when you are WANTING to go in.