If you have enough available storage on your system disk, you can set up dual booting to take macOS Sequoia for a spin. Here's a very good reference video:
https://www.youtube.com/watch?v=xzUPFeat9U4
Otherwise, one can use an external SSD or flash drive. Just remember to perform a TimeMachine backup before attempting any of these solutions.
conradwt
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After a bit of research, it appears that one can run via the iOS simulator but one will receive errors when trying to run via My Mac or Xcode Previews.
Yes, I also noticed that the shell is hanging in macOS Big Sur Beta 1 and 2. In macOS Big Sur Beta 2, I was able to resolve this issue by switching from my MacPorts back to the Apple's version of Zsh by doing the following:
1) In Terminal app, changed preferences for Shells Open with to the following:
/bin/zsh
Note: The above didn't work for me using macOS Big Sur Beta 1.
2) In the command line, performed the following for consistency:
chsh -s /bin/zsh
Well, I wish that this helps both you as well as others get past this issue.