Hi @zynthianers!
I published a new post in the forum regarding the new RBPi-4:
Your feedback is welcomed! 
Regarding the new Buster SD-image, as you probably know, build script need to be modified to correctly work with Buster. I will start to work on it as soon as possible, but if some of you want to collaborate with the task, i would suggest following the instructions here:
that allow to run the setup script on a fresh Raspbian image.
You should try to run the setup script step by step and try to solve the errors. Most of them will be package-related, so easy to solve, hopefully.
My first RBPi4 will be here tomorrow, so i will be highly motivated very soon. I want to try Pianoteq with the new RBPi4 … ohhhh yessssss!!
Kind Regards!