From yesterday, you can begin to realize that things seem a little "different from all the Google products.Working on a project to bring new experiences and best of Google, and in the coming months, Google continue to see more updates on look and feel. The Home Page is traditional to get a little change:

How people use and experience of the Internet is evolving and Google goal is to give us greater foil and consistency in the online experience that works independently of the Google product which we use or what device is used. The new Google experience have begun to work towards is based on three key design principles: development, elasticity and effortlessly.