LIVE: The big Apple Watch event

We're at the Yerba Buena Center for the Arts in San Francisco today for Apple's big press event, where everybody expects the company to formally unveil the Apple Watch.

The watch is Apple's first major new product line since the iPad in 2010, and the first with Tim Cook as CEO, so it's an important day for the company.

We expect to get a demo of a lot more features than Apple was able to show last fall when it first announced the Watch, and hear about pricing and availability.

But most important, we'll be looking for Apple to present a clear reason why people should buy one of these things. When the iPhone was introduced in 2007, it was the first phone with a really usable web browser. When the iPad came out in 2010, it was a simpler, cheaper, lightweight PC replacement.

We don't yet have a clear sense of what Apple wants the Watch to be. But we'll find out today.

Apple might also announce some other products, like updates to the MacBook and MacBook Air, as well.

Check back here throughout the morning as we update this post with pictures from the event. The presentation starts at 10 a.m. local time, 1 p.m. ET, and we'll cover every minute of it right here. Refresh often.

Until then, here are some stories on the watch:

• Apple has invented a new kind of gold for the watch
• Apple is now a luxury company. Or, at least that's what it wants you to think.
• Tim Cook made a joke on Twitter
• Here's what could go wrong with the Apple Watch
• The biggest question about the Apple Watch