Macworld keynote live coverage starting at 12 p.m. (9 a.m. PT)

Hours before the Macworld 2008 keynote, Apple offered this teaser message on its website. Image: Apple.com

FORTUNE will have live coverage of Apple (AAPL) CEO Steve Jobs’ keynote at Macworld San Francisco, beginning at 12 p.m., at https://fortune.com/bigtech. Jobs is expected to unveil new Mac computers with Intel (INTC) chips, a new version of Microsoft (MSFT) Office for the Mac, updates to the iPhone that runs on AT&T’s (T) U.S. network, and enhancements to the iTunes Store.

In the hours before the highly anticipated keynote, Apple offered this teaser message on its site: “There’s something in the air. Watch the Macworld 2008 Keynote by Steve Jobs, Tuesday afternoon on Apple.com.” The message could be a reference to new wireless technology, streaming digital content, or something else – with Apple, you never know.