Improve Data Visualization (Analytics) and/or Charting options -- thus making EXCEL the defacto app.
Improvement should include more options (including 3D) than presently available -- bringing more up to par with other offerings (such as Tableau, Prezi, etc.)
This is a very broad statement. Please provide additional details on the specific features that you would like to see. Ideally log those as spate feature requests so that others can vote on them individually.
Would be extremely helpful in creating a well-rounded Office 0365