Kudos to those readers who have pointed out and sent in this automated reply being sent to anyone requesting information on Bungie's presence at Macworld SF:

Thank you for your interest in MACWORLD Expo/San Francisco 2000. In response to your e-mail, Bungie Software has not yet reserved exhibit space for the show. We welcome Bungie Software's participation and we also hope that they will be joining us once again this January. Please contact Bungie directly with any questions regarding their exhibit status.

And the ball bounces back into Bungie's court. I'm sure they'll arrive at a conclusion soon, folks... give them some time, and let them announce it when they're ready.