Starting next week, people using older spreadsheets (those created prior to Dec 2013, including any subsequent copies) in Google Apps domains on the Rapid release track will see a notification about an upcoming auto-migration to the new version of Google Sheets. They will be directed to the Help Center to learn more.
The actual migration won’t start for another 2-3 weeks, and no action is required as a result of the migration. No data should be affected; however, in rare cases the results of some formulas and some other features may be slightly different. See "What's different in the new Sheets?" in the Help Center article for more detailed information.
You can tell what version your spreadsheet is in by checking to see if there is a green checkmark at the bottom right of your spreadsheet (the checkmark is found on new Sheets only).
Rapid release; the notification will be shown to Scheduled release domains closer to the actual migration date
For more information:Help Center
Note: all launches are applicable to all Google Apps editions unless otherwise noted
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