Mortgage rates broadly have been more or less stable over the last three or four weeks. They'll start to trend up based on the pricing of the bond markets. We should expect by this time next week that fixed mortgage rates will probably be 20 basis points, or 0.2%, higher.
As to what that means for affordability, we're already at near-record levels of unaffordability. I don't know the exact number, but it will probably add another $100 a month onto the monthly mortgage payment a buyer would need in order to buy into this market on the average-priced home.