Two points:

1) Crayola got there before Apple did.

2) Rounded corners patent.

They could also be pointing out that the device color matches the OS color. I'm pretty sure Apple has never done that before.

In Mac OS 8, the 'yum!' Gestalt selector returned a value corresponding to the case color. The OS tinted based on this value (at least on first install.)

It isn't just the colors, the shape and the plastic back look quite similar to the Lumia 620.

https://www.google.com/search?q=lumia+620&tbm=isch&tbo=u