HTC is ready to commit to an Android Oreo upgrade. The company tweeted today that it will update its devices to the new OS starting in the fourth quarter of 2017, starting with the U11. Oreo will eventually come to U Ultra and the 10, too. This seems slightly ambitious, but at the same time, if you're going to release an expensive flagship device, you should also be able to keep it up-to-date.
Google officially released Android 8.0 Oreo this week, although it isn't ready for phones just yet. The company says builds for the Pixel and Nexus 5X / 6P are in carrier testing and over-the-air rollout should be happening “soon,” including updates for Nexus Player and Pixel C devices. If you don't want to wait for HTC, though, you can download the OS yourself by following instructions on Google's blog.