@maughact regarding your comment "I'm confused why these forms are not ready.  Illinois is ready for e-file today."

This may help explain the difference between e-file and form availability, based on the format itself:

E-file approval covers the xml data transmitted from the program to the IRS, and state taxing authorities.

Form approval is often dependent on final forms being publishing, graphic approval, calculations, and 2D barcode (when applicable) among other things.