In an email I just received from the Macworld people regarding registration for future Expo events, this was at the bottom:
=============================Mark you calendars for 2003:The Moscone Center, San Francisco, CAJanuary 6 - 10, 2003*Registration to open mid-SeptemberJacob K. Javits Center, New York, NYJuly 14 - 18, 2003=============================
Apparently Macworld Summer 2003 will remain in New York – at least until the new Expo Center is finished in Boston!