The switcher he envisions would allow apps to maintain a 'semi-active' status even when not in use.
The benefits of such a system are seen in the switcher concept video, where the user is able to switch between the Mail, Haze and Flipboard apps, whilst watching them update live. There are more benefits then simply live updates however. For example, the combination of full app previews, the large icon and name presented underneath each app, make it much more obvious which app you’re switching to, and prepares you for what to expect when revisiting that app.
His concept also allows for prime positioning of toggles such as music, brightness, etc and the ability to search.
Yes, I realise spotlight provides system wide search already, but that’s the thing: it searches system wide. The benefit here, is that you’re searching for apps and apps only. This will ostracise apps from other general data, allowing them to be found much quicker. Plus, you’re seeing a live tile at the same time. In a way, this is similar to launchpad for OS X.
Check out the video below or hit this link to see it full screen on your iPhone.