Ok, I just want to make a few points...
1: this is not the final build that will be in the Mac App Store.
2: Before installing, the Catalina installer tells you all the software that is not 64 bit, and gives you the option to not install the update.
3: If you are still running Mojave, do not update to this GM/DB11/PB10. Just wait for the public release, or, even better, wait for 10.15.1
4: after installing, if the Music app is gibbing you problems with artwork, try this work around.
Open Music, click Music in the menu bar, go to preferences, then go to Files, then underneath Music Media folder location, click Reset. It will default to a new location, "/Users/______/Music/Music/Media. Then press reset, and it will take a while to move all the files. But this fixed all my issues.
Same with TV app, new location will default to /Users/______/Movies/TV/Media