Apple is apparently about to unveil big news about iTunes, the Mac Observer reports. The Apple Web site today is teasing that it will have an “exciting announcement from iTunes” tomorrow.

The Apple home page even displays four clocks hinting at what time the news will break in various cities. It is apparently coming at 10 a.m. on the East Coast and 7 a.m. on the West Coast.

The site contains the message: “Tomorrow is just another day. That you’ll never forget.”

Among the rumors that have begun to circulate, according to the story: The announcement will concern the Beatles catalog, a subscription music service or the use of the cloud for iTunes libraries–or all three.

The story notes that the announcement is apparently being made only online, not through a media event.