RPGamer has an interview with Kathode over at thier site.http://www.rpgamer.com/games/elderscrolls/elder4/elder4interview.html
RPGamer: Patrick Stewart aside, have any well-known voice actors been involved with the Oblivion project, and if so, who and how large a part do they play in the game?
Gavin Carter: We just recently announced that Lynda Carter, Wonder Woman herself, will be doing voice acting in the game, so we're very happy to have her aboard. Aside from that, there are a few other names people will recognize that we'll announce in the coming weeks. We're very excited about Oblivion's voice talent.