We are another client looking for the functionality described here: https://answers.atlassian.com/questions/54487/aggregating-assigned-hours-for-team-members-in-a-sprint.

I know using hours isn't true Agile (as per this conversation https://answers.atlassian.com/questions/84349/rapid-board-time-estimates-with-sub-tasks) but it is something that would be extremely valuable for the majority of us that can't work in pure agile due to client commitments.