The new Microsoft Planner: A unified experience bringing together to-dos, tasks, plans and projects

Some feature requirements for Planner if working/integrating with the online MS Projects:

Field for Story Points (to size tasks easily)

Business Value Score (to enable tasks to be priorities based on a Value Score) - Foxly for JIRA does this well

Add a PRICE/COST field to track budget expenditure

Allow the creation of Sprints (to manage tasks for easily) and Sprint Filtering

Allow more labels to be created - current list is too restrictive

Allow To Do Tasks/Flags to be added to Planner Boards 

Analytics: Burn Down Charts, Cycle Time, etc (some reporting would be good)

Allow Planners to be Linked together to create a Program Roadmap.

Finally, MS Projects Desktop needs to work with MS Projects Online and the online version should support the file format. 

Centralised Resource manager (to help calculate capacity)