Repeated from above:
Pivotal has 3 regular meetings: daily morning standup (short), iteration planning (monday), retrospective (friday).
Any new stories during the week that haven't been pointed get pointed in the morning meeting.
Sounds like Pivotal combines elements from scrum and kanban in a way that works well for them. That's what you're supposed to do with agile -- keep adjusting the process until it's working well for your organization.
In all seriousness I'm curious about the story pointing. Does the team meet together for that at Pivotal?