Looking at the source, there are two arrays of image filenames specified between script tags on that page. One is "IMAGES", which is referenced by the JS elsewhere, and specifies overlayed over the rectangle.
Incidentally that's also one of the advertised high points about iPhone 7 -- great pictures in low-light.
As an aside, I find the attention to photography by Apple, Google, et al quite intriguing. It makes total sense. On social media, we posture, we put out our best self. Having sophisticated pictures (bokeh? yeah that'll make it look fancy. Not a lot of noise (as is the case for pics taken in low light)? that's another something). In a fantastic way, it is actually the best way to advertise the phone -- the photos people take do it for you! You see your friend's great low-light pics, and you realize your phone can't do that. That's like one of the few remaining forces to compel you to invest into a phone: a phone being a device that's increasingly becoming a commodity for its lack of distinguishing factors.
I wonder what will be the next area of war for phone manufacturers ... maybe AR/VR? Finally wireless charging that works well? Finally battery that can last days (of semi-active use) instead of hours?
I compared my iPhone 6 against a iPhone 7 yesterday. The difference in low light is noticeable even before taking a picture. That, along with the dual lens, may be enough for me to make the change.
All of you are wrong. Aliens have been in touch with Google after hearing about its deep learning prowess, and their partnership announcement will be exclusively broadcast on YouTube live streaming on Oct 4th.
1. The phone will be available on T-Mobile and Verizon (Magenta/Red)
2. Camera will be good under low-light conditions without flash.