It looks like the Apple event originally scheduled for February 26th has been postponed until mid-Marchish. Apple would have made the decision last week because they usually allow a journalists a week to arrange travel to the evnt. The reason for the delay is likely that the SDK isn't ready for primetime and the developer apps aren't polished enough to be shown.
Apple has introduced something on just about every Tuesday in 2008 so far so we still are likely to see a new release of some sort - MacBook Pros seem like the most likely candidates. There are still lots of things that could be released at any moment including:
More European Apple stores (Munich, Swiss)
More iPhone areas (Italy, Austria, Spain)
