"A new look and feel for Google Search and ads on your phones and tablets. It's cleaner and simpler, optimized for touch, with results clustered on cards so you can focus on the answers you're looking for," informs Google's search blog.
Ads stand out a lot more and, depending on your phone's resolution and screen size, you might not even see a regular search result without scrolling down. Google shows up to 2 ads at the top of the page and no longer uses a different background color. There's just a small "Ad" label next to the URL.
Sections are clearly separated and there's more white space, so the information density is lower.
Pagination has been simplified and you can only go to the previous or the next page of results and to the first results page.