Yes, its only couple of days since WWDC and Beta release on Mojave, but I thought I will share the compatibility and some known issues we have experience with Beta so far.
The upgrade might fail and stop at 2min if Malwarebytes Endpoint Protection is installed.
If you managed to work around and get into Desktop, it will freeze entire screen. NO CMD + TAB to escape is possible, including no backlight or volume. Completely freezes.
Works on safe mode, so the only way to get your Mac up and running again is removing Agent from library manually.
The logs shows this error in repeat.
Jun 5 23:35:31 RK-Macbook-Pro EndpointAgentDaemon: objc: Class DDASLLogger is implemented in both /Library/Application Support/Malwarebytes/Malwarebytes Endpoint Agent/EndpointAgentDaemon (0x1033b9da8) and /Library/Application Support/Malwarebytes/Malwarebytes Endpoint Agent/PlugIns/epa.mac.plugin.assetmanager.plugin/Contents/MacOS/epa.mac.plugin.assetmanager (0x105de21b8). One of the two will be used. Which one is undefined.
Hope this helps!