Apple is revving parts of its website with high-resolution images designed for the new iPad’s Retina display. The images can currently be found on the Apple.com homepage, as well as the iPad section of the site.
Though it was previously believed that users needed to enable HiDPI resolutions with developer tools on their Mac to view these images; however, there’s a workaround. You can read more at http://macte.ch/xYTGj .