
At Google I/O 2014, it was announced that new features would be worked into Docs, Sheets, and Slides. The most important one is the ability to use Google's productivity suite with any type of file and editing it without the need for another program. This means users can now view and edit Microsoft Office files without actually owning that productivity suite's software. Another feature that has gone live is Suggested Edits. Users can view suggested changes made by others and have them either published or dismissed.
The aforementioned features are available today for all users.
Source: Official Google Enterprise Blog