The Expo is right around the corner. I'm sure we'll see new balls on most of the companies' pages after that.
Motiv doesn't release balls the same way other companies do. They will release one ball at a time on a roughly 45 day interval. Venom Cobra first of June. Forza GT in mid July. And a new piece for late August/early September.
There is an obvious gap at the top and we know why. But at the same time, it takes longer than 45 days to develop a ball. Motiv had a schedule in mind for the year and what we see now are those balls. Obviously circumstances can affect that schedule (legality along with sales).
With that said, I feel confident in predicting a new high end ball for the next release after the Forza GT. I also think it will be different than the replacement ball for the Jackals. How much different, I do not know.