"We reached out to our friends at Lucasfilm and Disney, and since then we've been working together on building google.com/starwars. It's a place for fans, by fans, and starting today you can choose the light or the dark side, and then watch your favorite Google apps like Gmail, Google Maps, YouTube, Chrome and many more transform to reflect your path. And that's just the beginning. We've got more coming between now and opening night — the Millennium Falcon in all its (virtual reality) glory included, so stay tuned. And we've hidden a few easter eggs, too. So awaken the Force within, and be on the lookout for things from a long time ago in a galaxy far, far away," mentions Google's blog.
There's a new Star Wars theme in Gmail, a new progress bar for the loading page and probably some other changes.
Google Inbox has a Star Wars background image.
Google Calendar adds some Star Wars events like "Star Wars: The Force Awakens in theaters everywhere".
YouTube has a new progress bar for Star Wars fans. Check the player too.