Jill isn't the writer, she's the director. The first episode she directed was Chasing Ghosts also written by Horvath. She also directed KK when she did the play Love Letters last summer. Hope this episode will be as good as Chasing Ghosts. Unless the season finale tops it, Chasing Ghosts was easily my favorite episode this season so I have hopes for 407.
Does Cat have her wedding ring on in that picture?
Hard to say. When I zoom in her ring finger is folding inwards making it difficult to tell. Even in other S4 pics, it's very hard to see if there's an actual wedding band in addition to the engagement ring from S3.
I think they are teasing US. Maybe all the wedding stuff in S3 is a joke or maybe, but this is only my mind running free, they have changed the S3 finale when they find out that they were renewed. i think they will give US the real wedding at the very end of the show