The conference is in total four days, but first one is training and keynote, last day is FBA only. This is a change from previous conferences and the reduced cost for FMI could lead into cheaper tickets which may bring more new faces to the conference.
If you like to speak, you can apply for a session. Please make your FM 15 certification first if you are not yet certified. Speaking has the advantage of 4 free hotel nights and a free ticket to the conference.