After the fall of Iraq a few brave Iraqi souls came forward with information. As the resolve of the coalition became more evident, more came forward. Even more did so after Bush's visit. I fully expect the intel floodgates to open after this. Furthermore, I expect freedom loving Iraqis to more actively seek revenge against the Saddam remnant.
Saddam may eventually talk, and if he does, it will be gravy. Much more will be learned from the citizenry before then.