I tested it with my iPhone by typing Walmart. I get in the suggestion box pretty early the walmart domain without finishing the word. The mobile screen is so small that the keyboard is covering half of the screen, that I can't tell if there are any search results in the page shown. Technology to display the text is Ajax and html5 to avoid reloads during typing.
I tested the same on the iPad with target and same result, but there the keyboard is not covering the page, but still don't see any results in the page only in suggestion box, which exist since a long time.
With bing I get the same but does not claim instant results.
Google is claiming that this rollout is not yet for everybody available. Maybe I have to wait to see real instant search.
Solsie is showing a video how it is working on an Android phone.
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