Anyone dealing with the new SB-9 rules regarding setbacks?

[Jacknich]

I noticed that recently signed SB-9 includes (verbiage paraphrased) The bill would set forth what a local agency can and can't require in approving the construction of 2 residential units, including, but not limited to, authorizing a local agency to impose objective zoning standards, prohibiting the maximum setback requirements under all circumstances. A local agency may require a setback of up to four feet from the side and rear lot lines.

This would be a huge benefit for anyone wanting to put an ADU or guest house on a lot zoned R3 where the setbacks are ten feet.