This short preview from the upcoming episode of "Mad Men" has some juicy details about our beloved Joan, played by Christina Hendrick. Enjoy.

"Mad Men" airs on Sunday nights on AMC at 10pm.

The fourth season of "Mad Men" is almost here, and the Sunday night premiere has the Banana Republic-wearing, avatar-creating fans of the AMC drama swooning with anticipation.

But those fans should brace themselves for big changes.

It shouldn't be a surprise to anyone who saw the Season 3 finale that Season 4 would bring significant changes for nearly everyone in the cast. The last we saw, Betty (January Jones) was on a plane to Reno with her new boyfriend Henry, and Don (Jon Hamm) had just conspired to break away from the British-owned Sterling Cooper firm (along with Roger, Bert, Pete, Peggy, Joan, Harry and Lane) to form a new firm, Sterling Cooper Draper Pryce.

So those changes (new offices, new homes) shouldn't come as a surprise. And yet, they do. . . .