If you are a paid up registered Apple developer, more than likely you know exactly how to download and install iOS 7 beta 1. If not, you can click on the sourcelink to begin. For those iOS users who never did shell out the $99, well, you are going to just have to wait until the fall when iOS 7 is expected to launch. Most likely the timing of the release will coincide with the release of the next Apple iPhone.
Does the new OS with the new look and new features preclude Apple from making any drastic changes to the hardware on the next iPhone? Normally you might think so, but let's face it. Because iOS had never been redesigned before, we are in uncharted territory here.
source: Apple via RedmondPie