Since the anime ended and revealed their last number (Number 99) the Manga as well as thebooster packshave had to reveal the remaining numbers. With 73 existing Numbers revealed through the anime, manga and card sales the two manga series focussed on Zexal (Zexal & Duel Team) have 27 remaining numbers to show.
As the first booster pack for the new series has been reveal to contain 1 number (Number 86) its safe to think that more can be revealed.
The latest Chapter of Zexal has revealed during a duel betweenYuma andKite. Kiteuses a card to special summon a "Blank" monster 1 rank higher than his "Armored Galaxy Eyes Dragon ".Which could mean a new rank 9 number is going to be revealed in the next issue.
So this topic is pretty much going to be where the final numbers are revealed and from what source