Because Harry's Law actually wrapped production yesterday, Kathy responded, she is free to return to Dunder Mifflin -- and she will be, in fact, in "a couple" of episodes this spring. (Now that she's done being Harry from Cincinnati, she's free to be Jo from Tampa, traveling to Scranton -- all filmed in L.A. Got that?!)
When I pressed her further afterwards, Kathy swore she hadn't yet read any scripts, and so she has no idea as to who's going to take over the Scranton branch. She did like my geeky idea, though, that her great danes from The Office should pop up on Harry's Law. Attention, NBC: crossover!