There has been many new features introduced with the release of Approval Manager 2012. You can read about all these new features by clicking on the links below.
Spark! Comment Replies and Attachments
Annotation Color Picker in Spark!
Spark! Pen Tool
Creating a Group Proof
New Group View Layout
Notification Email Layout and Features
New Active Proofs Page Layout
Handling Unsupported File Types in Spark!
Individual File Approval Status
Proof Workflow Page Changes