UPDATE 4:10 a.m. PDT April 1: It's up! Check out Gmail custom time to see how Google uses an "e-flux capacitor to resolve issues of causality."
It looks like we are getting a preview of Google's April Fools' joke for Gmail a little early. Google put the link in the screenshot above on everyone's Gmail page. As of right now, the link only takes you to a 404 error screen, but presumably Google will post its joke in the near future.
It seems strange that Google would push a dead link to all of the Gmail users out there, especially around three hours before April Fools' Day begins in Mountain View, Calif., so maybe it didn't mean to publish this just yet. Any speculation as to what Google has in store for us with "Gmail Custom Time"?