A new post on Reddit states that some Nexus owners are experiencing a yellow hue on their display. 6P owners have nothing to worry about, this seems to only be an issue with the 5X. However, good news is Google will willingly replace it if you have the issue.
If you’re experiencing a yellow tinted overlay on your Nexus 5X, you may want to contact Google’s customer service team as soon as possible. Not all Nexus 5X devices have the issue, but many do. The problem may be hard to notice at first, but when put next to a smartphone without the associated issue, you’ll immediately notice the difference. So if you have a Nexus 5X, put up something white and check for the hue. Some have been able to shake off the hue over time, but it’s strongly recommended to get a replacement from Google.