Ans. Some of the additions in workflow model are :
1. SharePoint 2010 workflows are build upon the the workflow engine provide .Net Framework 3.5.
2. In addition to the SharePoint lists we can now create workflows for SharePoint sites as well.
3. SharePoint Designer 2010 also has a new graphical workflow designer for designing workflows and deploying them directly to SharePoint.
4. Another Improvement in SharePoint Designer 2010 is that it now allows you to edit the out-of-the-box workflows that come with SharePoint.