The Microsoft Power BI team was fast and furious in 2015, and there are no indications they are slowing down in 2016. If you haven’t checked out Power BI V2 since it was first released last summer, you might want to take another look. Many features have been added and updated since then. Based upon the release schedules since July, it seems there are 3 separate release cycles for Power BI:
The Power BI Service (PowerBI.com) gets weekly updates.
The Power BI Desktop tool gets monthly updates.
The Power BI mobile apps get monthly updates.
I expect no fewer than 6 updates per week from the Power BI team.