APK teardown of ARCore 1.5 shows some unreleased smartphones are approved for the ARCore support.
Some of the unannounced or unreleased Smartphones are already approved for ARCore which was recently available in APKMirror. Android Police gave the teardown where the team has found that several unreleased smartphones listed out in the code. Phones like OnePlus 6T is literally listed under the common name, not even code name as for several devices like AOP_sprout which is Nokia 9 and the PNX_sprout, the Nokia Phoenix etc.
The testing of these smartphone means Google has already tested these smartphones in the ARCore 1.5, we do not have enough information about the upcoming devices. But Google has accessed all the listed upcoming flagships from a variety of Manufacturers. One of the interesting facts is, the code also hinted that there is a B version of Vivo Nex!