Part II of the Senate Select Committee on Intelligence Report found that the Intelligence community fairly accurately predicted the instability, exploitation of situation by Al Qaeda and Iran, and civil strife between Kurds, Sunnis and Shia's. It made specific recommendation including retaining much of the Iraqi army. Included in the report are declassified versions of the pre-war Intelligence Assessments.
Particularly interesting is Senator Feinstein's opinion in the appendices on what the report did not do. It did not provide any further analysis beyond the pre-war Intelligence Assessment.