Mozilla Launches Preview Of Firefox For Windows 8 Tablets
techcrunch.com
techcrunch.com
FWIW, iOS7 and the latest Android UI actually borrow a lot from the Windows Phone flavor of metro pretty heavily. The context switching between apps on iOS7 is identical to what MSFT introduced in WP7.1 (Mango.)
As for my desktop, I do spend a bit more time on the Desktop, and I'm more likely to use Chrome, but I've found I spend most of my time using modern IE11 because it's a completely adequate browser. Some sites designed for Chrome have problems, and so I'll jump into Desktop Chrome for those. Obviously, I spend a lot of time developing on my desktop machine, but I'll jump into modern for things like Twitter.
I think the killer feature for modern applications on both the desktop and touch devices is that they are naturally responsive - apps are designed to adjust to the width of the screen they are snapped to, making multitasking usability much better. There are few desktop applications that work well resized to a quarter size of the screen, but most modern applications work great with that use case.