This is just a quick update.
The bash wrapper script has been renamed as flang-to-external-fc. This was committed in 2 steps to allow a smooth transition for the buildbots that use it. The final patch is here: ⚙ D127094 [flang][driver] Remove references to the `flang` bash script.
As for flang-new, please visit ⚙ D125788 [flang][driver] Rename `flang-new` as `flang` for the discussion. Tl;Dr I suggested that we resume the discussion in our community calls.