Just as a heads up, following on the thread from How to find RStudio Preview in the new Posit.co site?, with RStudio Preview not being published directly on the new Posit site, the Preview homebrew cask has been removed (see How to find RStudio Preview in the new Posit.co site?). I know getting this back up on the site is a ways off, so throwing this up for anyone else that was relying upon homebrew support to install & maintain their preview builds.
These are still available.