The program depends upon who is going and what (if anything) attendees might like to talk about.
I plan to attend and will probably give a talk on something (perhaps the 40gs since I did the learning modules for it...perhaps something on the NOVRAM for the HP41...perhaps something for the 12c given its 25th anniversary).
But, the program is usually in flux up until about a week before the actual conference.
Things that most certainly will occur would include:
HP will have a discussion time where they do a question/answer with the attendees.
HP often has a more technical presentation about something.
Paul Hubbard will have a "internet bargain" session.
Wlodek usually has a topic.
Jake has a topic.
I'll have a topic.
Richard will have several topics but only actually present one of them. :D
For a good idea of what has happened the last couple of years, check out the websites for HHC2005, HHC2004, and HHC2003, which are still up (do a google search).
Most of all, come join us. :-)