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The new interface seems to set the stage for a fluid design that removes pagination and replaces it with infinite scrolling. In fact, most the changes are already available in Google Image Search, which uses infinite scrolling.
Alon also noticed a new UI for Instant Preview. "Page preview is a little different - the button appears to the side of the result text preview instead of to the side of the result webpage name. The site also doesn't pop up the preview when you simply click something inside the text, you have to hover over the magnifying glass icon."
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{ Thanks, Alon. }