A mysterious invitation from Apple for an event on Sept. 9, 2014. Who knows what will happen? (Courtesy of Apple)

At 10:00 a.m. on Sept. 9, 2014, at the Flint Center for the Performing Arts in Cupertino, Calif., we can be sure the world’s second-most-valuable company won’t unveil an end to planned obsolescence.

The exact nature of the latest must-have device or devices Apple will unveil is less certain.

We can recount the rumors swirling around the introduction of the new iPhone 6, likely to be introduced in Cupertino: Larger 4.7-inch and 5.5-inch screens. A “thinner, lighter chassis.” A better camera. And something called an “A8 processor” that, whatever it does, it does fast.

But this is mere prologue. We already use iPhones. Apple chief executive Tim Cook can make them sexier but, like two-term presidents, we already know what they can do.

What we all really want from Cupertino: the iWatch.

Sorry: make that Apple’s as-yet-officially-named “new wearable device” that artists imagine looks like a cross between a handcuff and an ankle monitor.

The, ahem, iWatch isn’t exactly the dawn of wearable tech. If you’ve read this far, you may already have a FitBit or a Nike Fuelband. But, metaphorically, the iWatch is shaping up to be the part of the day when the clouds roll away and the sun shines through.

Or, as one analyst soberly put it, the iWatch is “a more meaningful new product category in wearable tech.”

Though we can’t know yet, the iWatch may be remembered as the moment when Apple first began integrating computers and the human body. The iWatch will likely track our exercise and sleeping habits, sure. But it also may be when computers stop being something we use and simply become part of us.

As the BBC put it last year: “The version of you the world is interacting with via the devices you’re wearing is actually, well, you, rather than just your login to a particular profile – complete with your truly ‘personal ecosystem’ of apps and assets, ready to act on your behalf more like a collaborator than a tool.”

That’s a game changer.

For a year or two, at least.

Also relevant: As MacRumors points out, the Flint Center is where Steve Jobs introduced the MacIntosh computer 30 years ago — and Apple oompa loompas are building a huge, white monolith there.

What’s the structure for? “We are not at liberty to discuss that due to client wishes,” Flint administrators told MacRumors.

Maybe the invitations Apple sent to media will shed some light on what’s to come two Tuesdays from now?

Nope. The invitations Apple sent to media are, more or less, blank.

h/t MacRumors