Sarah L. sent along the following:
As of this morning, it appears that WWE Superstars no longer airs in the Chicago area. The show was delayed until Sunday mornings normally, but isn’t on any upcoming listings (and did not air today).
I have a few more details here: http://fallscountanywhere.wordpress.com/2010/01/17/superstars-no-longer-in-chicago/. I just sent an email to WGNChicago and will let you know if I receive a reply.