Macworld Expo will be shifted to February 9-13 2010 from January. Mainly to avoid overlapping with CES.
From Macworld:
Moving Macworld Expo away from January could have other benefits as well. With the trade show starting immediately after the end of the holiday buying season, Mac developers often had to weigh whether holding off on a product announcement until Macworld Expo was worth skipping what could have been lucrative pre-holiday sales.