Welcome az1, glad you decided to join us.

Well you asked what wise parents would do, but I'll answer anyway(har har har).

Personally, I like to have as much information as possible before I go in.
Who will you start with?
Perhaps you could find out what your state position on gifted education and id is. Not that you need it at this point, it's just good to know.
I would also recommend that you find out your district policies if you don't already know them.
The teacher involved sounds like she gets what's going on. Perhaps you can ask her opinion, or what is available.
I would not wait for conference unless it is next week!
Questions you could ask:
"You mentioned that _________ blew his tests out of the water(parapharasing! smile). Can you tell me more about that?
What does that mean? What is he supposed to know for _____ grade? Could he know it already?

Also, if you have a friendly relationship with counselor, perhaps that person can help again.

Good luck!