Create a task for your plan as a 'card' with content, checklists, links and comments, and tag with six colour tags.
You can add an image, document or web link and the card shows a preview.
Filter to see just your own tasks.
See all the tasks colour-coded by status.
See all the Plans you're part of in the Planner hub.
Notifications might be the weakest part of Planner today; just email, not calendar reminders.
Share documents for the plan in the Team Site library in sharepoint.
Office 365 Groups connect to dozens of other services; it would be nice to see these send content to Planner too.
The shared notebook is a OneNote notebook.
Planner uses Groups for membership and integrates -- sometimes at a basic level -- with many Office 365 features.
There's not enough integration; we'd like to see the custom labels for each document show up as tags in OneNote.
Planner should be a good tool in the education market, where Office 365 is making inroads.