We published a teardown of ARCore v1.4 a few days ago in which we discovered a few new supported devices, but there wasn't a full list and we didn't know what else the update broguht. But now, Google's page of supported ARCore devices has been updated, and the Play Store listing has been updated with a changelog.
Here's the list of newly-supported devices:
Huawei Honor 10
Huawei Nova 3
Huawei Nova 3i
Samsung Galaxy A6 (2018)
Vivo NEX A
Vivo NEX S
Xiaomi Mi 8 SE
Our list actually had most of these devices save for the Moto Z3 (which was just announced today) and two Huawei devices. Our list also had some unannounced devices, like the Pixel 3 and 3 XL, Xperia XZ3, and Nokia "Phoenix."
And here's the changelog:
Support for passthrough camera auto focus.
Improved plane detection speed.
Additional image resolutions supported for computer vision.
Passthrough camera autofocus basically allows your camera to focus on an object that it anticipates will pass through. Google also claims that this update allows planes to be detected more quickly, and that more image resolutions are now supported for computer vision.