Microsoft has announced that they have completed roll out of the feature: view Planner tasks on your Outlook calendar. – View Planner tasks on your Outlook calendar, Eray Chou, Microsoft, April 11, 2018
You can do this now by having the meeting organizer publishing the event to an iCalendar feed.
Other features include drag and drop of event items in weekly and monthly views, enhanced group filters, get a scheduled reminder of tasks coming due soon. – Conquer time with new features in Microsoft Planner, Microsoft, February 5, 2018
Microsoft also offer’s an idea and feedback forum for this product.
You will see me covering more on this product and other Office 365 based applications both in simple updates like this and deeper dive posts.