Did you miss the link to the Catholic News Service story about the creation of the working group?  It does exist, and it is within the USCCB structure.  The fact that the staff seemed to know nothing about it is the problem.  Although it's also possible they weren't authorized to say anything and didn't.  (The poorly written homily suggestions, on the other hand, is inexcusable.)  Cardinal Cupich seems to be on top of things, if not out in front.