According to the Instagram account CandyHunting, Doritos has released a Ketchup and Mustard-flavored Doritos.
Canada has had the ketchup version for years, and they apparently love ketchup chips in general. But it's the first time they've been available in the U.S. The mustard version is brand new, and it's actually "Spicy Mustard". They say they're supposed to taste like Chinese hot mustard though, not Dijon. They're just doing a test run for now, so you can't get them in stores yet. They're only available online at Snacks.com. (PepsiCo owns Doritos and Snacks.com, so that's why they're selling them there.)
If they sell well and people like them, it sounds like they'll eventually be rolled out nationwide.