Mazda Director of Design Derek Jenkins tells us that the MX-5's sides have purposely been left nearly devoid of creases both because the Miata is so small and as a sort of homage to the simple design of the first generation.
The new Miata is wider and lower than the previous model -- nowhere is that more obvious than at the nose, which dips toward the ground. Overall length, however, is about the same as that of the third generation.
This means we'll probably see Bluetooth, app integration, available navigation, and more. What I didn't see when peering around the MX-5's cabin was a CD slot. There are, however, a pair of USB ports and an SD card reader at the base of the center stack.