Hi! I also attended the FVE last week.
I have been doing some research and asked some of the admissions advisors and it's to my understanding that it is a good sign, but not a definitive yes. The FVE program was intended to sway competitive applicants into going to USAFA. People applying to USAFA also have a chance of getting into West Point, USNA, or other prestigious civilian colleges (UCLA, Yale, Harvard etc.). FVE was designed to give 60 highly competitive candidates an in depth view of the USAFA campus in hopes that you would complete your application, and attend their institution.
As you saw, we were given a lot of information about the institution and had many opportunities to ask current cadets and recent graduates any questions that we had. We also were given access to attend classes that current cadets take. This privilege isn't given to every applicant and since only 60 people are chosen, it's a selective program and shows that the admissions committee sees value in you.
Again, it is not a definitive "you will get in" but it's a good sign that they are interested in you.
Hope this helps.