The threat of a price hike may increase sales in the near term (especially the back to school sale) and could tamper down the drop in profits a bit. After all, the hardware bill of materials is not the only thing deciding the product price.
A bigger hike now could have a snowballing effect on “switchers” and the potential services revenues they could bring.
I’m guessing that Apple will increase the prices of all products with the iPhone and Apple Watch launches in September. The increase in prices for currently selling products will be a store update, without any press release or news or tweet or any notification. That’s the (quiet) Apple way of doing things.