Today I discovered new improvement of Google search result from Google.com, It highlights each listing with soft-blue color when you do mouse-over. The highlight will appear only when you are using mouse. If you use keyboard, it still look the same as usual.
You may also notice in this screenshot, Google also displays the "Zoom" icon, this icon will use as Full Preview of the listing, it will be partially launching and testing for some particular markets at this moment..
Google keep testing on new user interface, introduced this year more than 150 User Interface changes. User feedback and interactive from users will be used as ranking signal in the future.