In order to submit your feed to iTunes, you must specify the URL for your feed. In addition to the link that is available directly in the Feed Management section in the backend (added in the 2.0.1 release), this short tutorial will show you three methods to accomplish this.
The content plugin for Podcast Manager 2.0 was re-written to use a new default player syntax (don't worry, the 1.x syntax will keep working). The benefit to this is that it fixes a bug (Have you changed your podcast's title? If you did, you had to update all plugin uses.) and it enables users to override the default player settings on a per-use basis.