https://www.cnet.com/news/latest-photo-leak-for-cheapest-galaxy-s10-is-completely-bananas-galaxy-s10e/

The Galaxy Note 9 had been briefly rumored to come in yellow before it launched, but that turned out to be just the color for the stylus that came with the staid blue model.

You might say it hearkens back to Apple's early experiment with colorful phones, the iPhone 5C.