
SetteB.IT has posted two sets (one and two) of photos from the preparations for Macworld Expo 2009.
While the banners are not particularly revealing, Apple's booth area is shrouded in black cloth as is typical prior to the event. One Macworld sign spotted on the street reads "even the small talk will be big":

This, however, appears to be an IDG-sponsored banner rather than an official teaser from Apple and reflects Macworld's website promotion that "small talk is the biggest talk we do".
Finally, the exit sign shows the dates for next year's Macworld San Francisco (Jan 4-8, 2010) with the words "The start of a new era" -- acknowledging Apple's decision to stop participating in future Macworld Expos.