Is the updated WhatsApp (iOS 7 theme) only available on iOS 7?

I run iOS 6 on an iPhone 3GS. I got the iOS 7 redesigned update for WhatsApp.
After the update I found absolutely no difference in the UI.
Although pictures of the update on other websites suggested a iOS7-ish redesign.
So I was wondering what this is about.
WhatsApp version: 2.11.5

All apps that are redesigned for the new interface of iOS 7 will not change the UI of devices with iOS 6 or older, unfortunately.

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