Some of our favorite details are the subtle ones. For example, whenever a form is active, the menu shows a count of your total responses. And now it's even easier to insert a formula, switch between number and date formats, or access help content.
Behind the scenes, the new streamlined interface loads the spreadsheets application even faster.
Everything you know and love about spreadsheets will still be available―just better organized. And the best part of these changes is that we'll have room to add more great new features. Stay tuned.
Posted by: Joseph Wain & Michelle Lee, User Experience Designers and Eric Bogs, UI Software Engineer
Link - from Docs Blog