Hey @philipp! The SDK update would include some breaking changes for common query patterns in Retool which raises the difficulty of implementing support for Serverless MongoDB. As a result we don't have a timeline on when we'd be able to add in support for Serverless, and will only be able to connect to Dedicated or Shared clusters in the meantime.
We'll keep monitoring this thread and prioritizing that larger scale migration against work on other new resource types and authentication methods. Please chime in here with a +1 if you are coming across this as a blocker getting spun up!