Hi I'm in FL too. I agree that you don't need to bring anything to the meeting -- except your sense of humor.
In our SD IQ score is only part of it. They also consult a checklist of characteristics of the gifted (here they have a scale from 1 to 5 on the characteristics and it has to add up to a minimum), teacher's recommendation, SAT10 scores, grades and portfolio. They will tell you what services your son qualifies for based on the criteria (pullout gifted, fulltime gifted, etc.).
The team from the school will also be involved in creating your son's EP and that could take place at the meeting.
The psychologist who administered the test will prob be present and that's a good opportunity for you to ask questions.
Make sure you get copies of the IQ test, the EP and any other evaluations they used.
I know the waiting can be nerve-racking! Let us know how it goes.