I've long wondered what Apple's plan for that. They still haven't added a way to specify an @2x splash screen for fullscreen web apps, so it feels pretty abandoned.
That's technically true, but they don't need to. You can use the same markup as the @1x splash screens and target retina devices with media queries. I wrote a blog post explaining exactly how to do it: http://taylor.fausak.me/2012/03/27/ios-web-app-icons-and-sta...