A very helpful feature. Thank you.
Unfortunately, there's a typical Microsoft breakdown between their different products. Tasks applet in the Clock application still only allows the "Tasks" and "Flagged Emails" task lists to be selected, which are of questionable utility. While "My Day", the most obviously useful list is not available.
I understand that Microsoft is a large organization, but common, nobody thought to coordinate between the Planner and the tasks in the Clock app to make sure that the users can get the most mileage out of your hard work of synching up all of the user's tasks with the desktop tools that help users focus and complete those tasks???
If your UX team is so lacking in the user insight, do ask them to get in touch. I'll be happy to help them out.