Great news from the K2 camp! K2 have just announced the Smart Forms technology and you can sign up for the Beta and learn more about it here. From what I have seen so far, this is an awesome technology that is going to make building process applications very exciting.
SmartForms are the natural evolution to K2 SmartObjects. They make it very easy to build forms based on them and to process enable them. The Forms designer provides a simple drag and drop design experience and publishing to SharePoint.