ex post facto doesn't work here, because after the new law comes out, you would be in violation of it. Ex post facto only applies when you do something that is made illegal before it is made illegal, once the law is made and the particular action is illegal, you don't do it anymore. The violation for tint is not having it done, but driving a vehicle with dark tint on it, which you would be doing after a law prohibiting that was passed.
Also, there is still a tinting law on the books in GA. However it was declared unconstituional by a judge. By having dark tint in GA you are still violating the law, but a ticket won't hold up in court becuase the law has been declared unconstiutional. The new law that they are passing will address the issues that the judge had with it.
Sorry for the thread hijak
...lets try keeping the info pertaining to the topic that had been established in the creation of this post. 
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Black & Tan 2000 SVT Contour #2137 of 2150
35,000 miles & counting !