Database migration from Platform 1.9 to Platform 2.0

Platform 2.0 will be the a major milestone release. We need to determine the challenges faced by implementers when they try to upgrade from 1.9 to 2.0
To complete the task
1) set up Platform 1.9
2) Play around. Make changes to the database
3) set up Platform 2.0 and make sure it uses the same database
4) report success/ all unresolvable issues faced