The answer is maybe. Although this is one intent of the law, it will depend largely on the choices you make regarding new levels of coverage your insurance offers. Michigan Department of Insurance and Financial Services (MDIF) responds to this question on their website.
“Because the new law will allow drivers to choose a level of medical coverage, insurance companies are required to reduce the premium for this coverage (known as PIP coverage) so that there will be an average reduction per vehicle based on the level of coverage chosen. Your premium and savings will depend on the PIP option you select and other coverages you choose.”