Without an actual official statement directly from Google, nothing can be said to be 100% irrefutable proof that the next iteration of the Android OS will be called Jelly Bean. However, the above picture is as close to 100% as you can get without that verbal/written confirmation. As you can see above, Google has continued their tradition of adding a new sculpture to their front lawn to show off the next flavor-filled dessert in the Android lineup.
The new sculpture they added is none other than a jar of spilled Jelly Beans, (either that or some clown-decorated kidney beans, but that doesn't sound much like a tasty dessert does it?)
Update: Apparently, the picture from earlier was taken while Google was assembling the actual complete statue, and someone "spilled the beans." As you can see from the new pic above, the final statue is of an Android shaped jar filled with Jelly Beans.
Source: NexusTablets.net via Google+ Fred Chung