a bunch of photos are still taken in 4:3, like photos taken by the Nexus 4 and 5 Phones. Instagram is 4:4 ration, as everything is square.
I agree it is an interesting screen ratio, and we will see how well it sells
35mm photography had a ratio of 3-2 , which just about equates to how we see. That's why it was so popular & became the standard for 50 years or so.
16-9 isn't far from that.