According to a former SEC attorney interviewd by Bloomberg, "“Madoff is about to enter his guilty plea. A criminal information is a consented- to criminal charge used to enter a guilty plea.”
The document released today byt the US Attorney's Office does not indicate if Madoff will waive indictment.
In related news today, the SEC announced it has plans to revamp its whistle-blower policy in wake of the Madoff fraud (and presumably the Stanford CD fraud as well). This comes after years of lax enforcement and a culture which seemingly did little to encourage whistle blowers to come forward.