Yep, but if you're worried, read John Gruber's take.
Curiously Apple has never been in a stronger position than it is now. They have *tons* of cash, no debt, impressive sales numbers especially in this economy both of iPods and Macs, and they have an impressive iPhone platform that's just barely out of the gate (making some developers millions of dollars!). They are not idiots, I can't imagine they would pull out of Macworld unless they had something bigger/better planned.
(That or Charlie Greco threw his last straw at Steve Jobs, what do I know?)
It looks like their after hours stock price has lost a couple percent, might be a quick way to make a few percent on my money... =)