If you go to Google and search for [bmi calculator] you will find a new interactive answer box at the top that let's you enter in your weight and height, which will return your body mass index score.
Green is healthy and blue is under or over weight. There doesn't seem to be red or other colors for extreme obesity or anything like that. Just green or blue.
Here is a photo:
I spotted this via Pete Meyers on Twitter and I am pretty sure he is right, it is new.
Forum discussion at Twitter.