R and SQL highlighting coloring with pseudo intellisense
Inheriting the NotePad++ or SSMS text highlighting would be a simple and welcome addition. A reach but still necessary aspect of this would be to have intellisense on both the R and SQL code (with a format button as well).
Access Query Engine 32-bit vs 64-bit
If a company is deploying 32-bit Office but a team wishes to leverage 64-bit Power BI, they will encounter an issue on pulling flat files from the web via the Access Query Engine. Including in the PBI download alternative engine not predicated on the Office Access engine, or allowing Power BI 64...
PeopleSoft Content Packs
Oracle PeopleSoft Applications content packs would be useful by larger organizations.
Clean up ArcGIS sample layers
The current beta ArcGIS layers are uncurated and should be composed of flagship data layers similar to that of the ESRI ones.
Unzip web data
Many of these world wide data sets are being unfortunately zipped, making it impossible to automate purely via Power BI, unless Power BI could call a small unzip procedure inside, or leverage a client's existing zip tools (Winzip or 7-Zip) to auto import this data.
Update Dashboards with JSON / XML / Web Data as Datasource
Publishing Power BI workbooks whose data source is from JSON, XML, Web e.g. no refreshes are happening on a local SQL Server etc.