Here's one of the articles about it.
I would say it just means you will have to register your homeschooler earlier.
Here's one by Home Ed Magazine Probably this is where you would start if you want to get envolved in fighting the law.
by oredebFebruary 12, 2013 at 4:23 PM
no they cant force you, if you homeschool! heres the law, http://homeschoollegaladvantage.com/files/statelaws/2012/ILPacket2012.pdf
it says you dont even have to register! and no testing required!! and only teach 176 days a year, so it shouldnt matter to you at all!
February 12, 2013 at 4:29 PM
The only thing it would change is that you'd have to do paperwork with the district at 5 instead of 7 to inform them that you will be homeschooling. Really not the end of the world. I live in Illinois too and I have 0 concerns about this new law. My plan was to officially start school this fall since DD is 5 now. A cute little homeschooling supply shop opened across the street from our library so we are super excited!
Most children already start school (whether in public, private, or homeschool) at 5; there is a mandatory age in all states and all that means is that your child has to start some type of "school" BY that age - it does not mean that you have to send your child off to public school.