Google Tests Material Design Mobile Search Interface
Opera Mini had a cool feature: when disabling images, the browser still displayed some placeholders with the dominant colors of the images. Google tests a similar feature for mobile image search: while waiting for the search results to load, placeholders are no longer gray, they use colors from the images.
Google also tests a Material Design mobile search interface with fluid animations and smoother interactions.
Update: Android Police has more screenshots from a Mechanical Turk account.