Oprah will be on "30 Rock," she will be playing herself. It is unknown in which manner, if self-deprecating or really herself. She hasn't acted since that awful movie Beloved, she actually provided voices for Bee Movie and Charlotte's Web. She once appeared as 'herself' on Fresh Prince, the lines sounded friendly but she came out like a bitchy Ms. Potts (yes, a fat joke). I heard this news on the radio and the DJs thought it would be funny if she would play a key grip or a coffee girl. I don't think Oprah would let that happen, nor would Fey waste her in such a role. From the quote from the blog below, I think she will be a mediator.
In the Nov. 6 episode, Oprah would play herself in several scenes with Liz Lemon (Tina Fey), and that story line would figure into an ongoing feud between Jenna (Jane Krakowski) and Tracy (Tracy Morgan). "30 Rock" creator Fey had long expressed interest in getting Oprah to appear on her show.
The Watcher Blog