From another tech blog:
"The one downside to wireless Android Auto is it will only work with Pixel, Nexus, and Samsung phones"
https://www.xda-developers.com/bmw-android-auto-2020/
So, i am all in with Android and have been waiting for this, but will be disappointed if it doesn't work with my LG or Motorola phones.
EDIT: I assume the limited compatibility refers to wireless connections only... will direct USB connection be supported by BMW for universal Android compatibility?