Illinois recently added the same here too.
I can drive legally with these on,as long as I keep the newly issued Il. antique plates & registration in the car at all times.The law allows me to keep the renewal sticker on just the Il. antique plates too.
When I saw this unused plate in a license plate collection,it was a HAVETOHAVE for me,being as my car was sold new in Joplin,Mo.
The local police here still pull me over from time to time,but I just keep a copy of the Illinois law article which allows this,in my glovebox and hand it to the officer along w/my Il. Antique plates.
They always end up scratch'n their heads saying they had no idea it was legal now.