Will tomorrow be just another Tuesday, or has the Mac version of the Messiah arrived?

Apple’s homepage has just updated to display this message: “Tomorrow is just another day. That you’ll never forget” — which has us salivating with expectation. Oh iTunes, you tease.

Intelligence suggests that iOS 4.2 is likely to drop tomorrow at 10 AM PST and that iPhone and iPad users will be able to download the software update through iTunes.

Is iTunes finally moving to the cloud? Streaming content a la Spotify? Subscription service? Check back tomorrow at 7 AM PST.