It has been announced that the event-limited "Final Form Frieza" will be implemented soon!It is important to note that the event-limited and ZENKAI awakening tags that will be implemented are likely to be related to the next gacha.
The hint of the character that will awaken ZENKAI is shown in the image above.There were many people who were predicting Z-hen Vegeta and Zamasu's half-body disintegration and fusion, but since Vegeta is a Saiyan-hen and Zamasu is a future tag, it's even harder to predict.
When it comes to the final form of Frieza, it's probably the Z Frieza arc, the movie Broly, or the F of Resurrection.If you look at the tag alone, it seems like there is a possibility that it will be expanded to Genealogy of Evil rather than an episode.