Just an observation, not an "official" answer to your question.
Members of the AWF VIP group generally have a reputation of 50 or higher. At 50 rep points, if you mouse-over the green jellies, it will say "X will become famous soon enough." Now, keep in mind that even after someone becomes a VIP, they may get positive or negative reputation, resulting in a change to this. But, generally speaking, at the time the current batch were selected, they were all at 50 or higher.
Aside from that, there are some members of the AWF VIP who are moderators or MVPs, who may not have had 50 rep points at the time this current group was selected. Reason's for this may be that they are new to the forum but have a reputation in the community for their helpfulness (as in the case of some of our MVPs) or are moderators here.
Just my observations, in no way to be considered policy or even the real way it all went down. From what I could tell when the process was being conducted, there was absolutely no randomness or favoritism...it was mostly based on a query from the vBulletin software. But I believe the general qualification is: "technical knowledge and helpfulness".