http://www.techradar.com/news/htc-u11-supports-android-oreo-on-unlocked-devices-starting-today

If you've already been able to dip into Android's Oreo, there's a good chance you're using one of Google's flagship Pixel phones. 

It's been a lot rougher, though, for anyone else who uses a device from the huge library of Android-powered phones, but you're in luck if you're an owner of the unlocked version of the HTC U11. As of today, you're free to download the highly anticipated OS in the US.