There is no formal plea agreement in place but he's going to plead guilty on 11 counts of fraud and money laundering. According to experts Madoff probably struck a plea deal with the government behind the scenes, thus saving the government some face after the fiasco they faced when they let him out on bail. Also, in a bit of a twist, it turns out two of Madoff's former clients were he's defense attorneys parents. http://www.latimes.com/business/la-fi-madoff11-2009mar11,0,3222627.story
His attorneys are getting so much bread even though Madoff knows he's going to jail for the rest of his life.