First is always the programmer, just to quickly flush out any major bugs. If it was Brian from IOE, he was probably doing that all night last night. Then usually the Manufacturing company's owner and high level park staff, as well as some construction workers from the site. I'm guessing programming went ok if RMC (and presumably the park too) is already taking the first few rides. Hopefully this means it will be ready relatively sooner! Brian from IOE told me that it is quite frustrating to insist on making the park personnel wait, as they are always really excited and want to ride first, but the program is not complete, so he (or Ann) always rides first to work out things like lift chain engagements and friction brake timings.
Completely offtopic but I felt like I had to point out that "Brian from IOE" goes very well with "Jake from State Farm".