Apple is continuing to decorate the Moscone Center this afternoon ahead of next week's Worldwide Developers Conference. Earlier today we saw water-covered banners go up for iOS 8, and now we have an image of the inaugural OS X 10.10 banner.
As you can see in the image above, the sign consists of a large X in front of a mountainous background. It's believed this is actually the 'El Capitan' rock formation in Yosemite national park, which would suggest Apple is calling the 10.10 update 'Yosemite.'