If you visit Google India today, instead of seeing the festive New Years Eve logo on all other Google home pages, you will see a somber Google home page with a white candle.

When you place your mouse over the candle, the message that comes up reads:

Here is a picture:

This is about bringing awareness to what happened and inciting change in that region on how the law and people respond to such horrible crimes.

Wikipedia explains the case as follows:

So horrible and Google is doing what they can here to bring awareness.

Forum discussion at Google+ and Google Web Search Help.