Google Mobile Based search interface is improving day by day, so that it satisfies the person doing a search from his/her mobile phone device. One such change I encountered when I was doing some search using safari browser on my iPhone on Google.
Just when I entered the search query and clicked go, it redirected me to the mobile web search interface of Google where it showed the search results with a small icon on the right of each search result which looks like a magnifying glass icon as shown in the image below.
Once you tap or click on this icon, it will start showing you the instant search results preview of each page pointed by the search results with which you can have a visual idea about the search results you are seeing for your searched query as shown in some screenshots I took.
With these visual instant previews you can easily decide which search result you want to open, this effect on mobile Google search can be experienced on some of the mobile web connected devices but not on all. In order to go back you just need to press the back button on the browser and it will revert back to normal view.