Hey guys! The idea of Vegito appearing to combat Fused Zamasu in the grand finale of the Goku Black arc has become more and more plausible in the past weeks, so much so that I'll be amazed if the Z-Fighters don't decide to fight fire with fire. Now, I have 5 "Implications" to give for why we can believe that he'll be showing him self in the upcoming weeks. (This list will go from weakest implication to strongest, just for clarification. I also combined 5 & 4 because they just seemed like they'd be better as a combined point.)
5 & 4. From what we can see in Episode 65's Preview, Goku and Vegeta aren't fairing well against Fused Zamasu. Along with this, the snipits we can see from it's preview look similar to the scene from the Buu Arc where Goku & Vegeta were both being beaten down by Majin Buu. (I may be overanalyzing this scene, hence why I'm placing it at the lowest place on the list.)
Goku & Vegeta in the Buu Arc, arguing about fusing.
SSB Goku and Vegeta struggling against Fused Zamasu.
3. Is it just a coincidence that there just so happens to be two Kaioshins on the battlefield who also have two pairs of earrings to offer?
2. Due to how Goku forgot the seal in the present timeline to properly use the Mafuba (Evil Containment Wave for you English Dub diehards), they're unable to use the technique to seal Fused Zamasu away.
1. In a Dragon Ball Heroes stream a week ago, we were given this information: "Goku & Vegeta fusion voice work is complete." Now, many may assume that this is just for XV2 and not Super, to which I also mention what other info was given with this statement: Merged Zamasu isn't a dual voice and the Mafuba jar is vital to saving the future. With all this said, I find this to be the strongest implication that we'll be seeing Vegito in the upcoming episodes of Super.
If I missed anything, or you have something else to address, be sure to leave your thoughts in the comments below!
Reference of where this information was taken from.