Google is testing a new mobile search user interface, where they center the Google logo at the top and make the overall user interface look more like the desktop user interface.
Android Police was one of the first to cover this but now more and more searchers are noticing it coming up.
Pedro Dias, a former Google search quality analyst, noticed it yesterday and posted a screen shot on Google+ as well.
Here is a picture of what the normal UI looks like:
As we spot more and more searchers noticing these tests, it become more likely that Google may launch the new look.
Forum discussion at Google+.