The Windows Phone SDK update for WP7.8 is already there and many people already started receiving the WP7.8 OS update in their existing WP7.5 handsets. If you are a developer, you might want to integrate the new Live Tiles in your existing application to give it a good look.
In this post, I will guide you to update your existing apps to include the new live tiles. Continue reading to find out the step-by-step process to integrate it.