only one word: A-WE-SO-ME! :)
This will be THE WP project manager.
As you ask for feedbacks, I would like to see two features, one little, one complex but a must-to-have:
1) "select/unselect all" checkbox added in checkbox serie of assigning duties, mails and so on
2) a timeline graphical representation (like GANTT Chart or similar) of project, with milestones and tasks.
And if you need a translator for italian localization, I'll be glad to help.
Thanks for sharing and best wishes for projects