At a glance changes according to Google:
Higher fidelity document import
It should be easy to move files saved on your computer to the cloud, so we made our document upload feature much stronger. Imported documents keep their original structure more accurately, so you can spend less time adjusting files you move to the cloud.
New Document and Spreadsheet Features
Documents support better formatting options like a margin ruler, better numbering and bullets, and more flexible image placement. Spreadsheets now have a familiar formula editing bar, cell auto-complete, drag-and-drop columns and more.
Faster & Greater Collaboration
The applications support up to 50 simultaneous editors, and documents let you see other people’s changes character-by-character as they type. Finally, we’ve added multi-user editing to drawings too, so now you can build flow charts, schematics, and other kinds of diagrams collaboratively.