The recent tweak also witnesses a new navigation panel will be placed on the left hand side of the search box providing extra options to refine the search and all the above in a context sensitive manner.
Say, one has to search for a political party, the most relevant options to narrow down your search would probably be "news" and "blogs", amongst others.
Once a blog option is hit upon a list of all the blogs for the particular party you're interested in pops up.
Google at its blog came up stating, "The new design refreshes and streamlines the look, feel and functionality of Google, making it easier to pinpoint what you're looking for. It's powerful, yet simple."
This is a welcoming statement offered to its customers where they get an option to refine their search pattern and thus have an easier and more intuitive experience.