Wait for New Colors
It looks like the 2019 version of the iPhone XR will come in some new colors.
Japanese blog Mac Otakara claims the new iPhone XR will come in six colors like its predecessor, but it looks like two colors will get swapped out.
Specifically, it looks like Blue and Coral will be swapped out for Green and Lavender. Apple will continue to offer the iPhone XR in Black, White, Yellow, and (PRODUCT)RED.
This information has been backed by Bloomberg's Mark Gurman. He's released a photo, seen here, that shows off these colors for the first time.
A report from AnTuTu backs up these claims and states that Apple will launch a green iPhone model later this year.
So if you want a green or purple iPhone, you'll probably want to wait for the 2019 version of the iPhone XR.