Chances are the interest rate increases are not going to be THAT much. You wouldn't be right or wrong to wait awhile.
If you're buying a 2017 model, the next 3 months is a good time to buy--when the factories are trying to fill up their production slots. They often give dealer discounts at Fall Order Writing meetings, and some dealers are willing to deal if they know they're going to have an immediate sale vs. having to pay 6 months of floorplan expenses before the Spring/Summer Selling Season.
To be honest, I hope things don't settle down. The more volatility the better. But you have to do whats comfortable for you. It's a pretty sure thing that we get a .25 point raise. But since everyone expects it, we might not get a whole lot of movement due to the raise.