HOW IS COMING TO THIS???
(I’m so sorry this is so late >.< )
In the manga last arc the Sailor Senshi achieve Eternal form. This form has the least amount of variation and uniqueness between them, and they do not get new attacks. The only attacks they get that could be “New” are when they end up brainwashed and have “Galacita” attacks.
As for the anime, I really would LOVE to see all the variations of the transformations, with hopefully more of the original components to the senshi’s transformations. I think that it’s much more likely to see something completely different from what the original anime had.
The anime deviated from the original storyline of the manga. In the Manga, this happened in the last arc, but in the anime, Chibi Chibi was not actually Sailor Cosmos but a starseed of Galaxia. We see a Vague Sailor Cosmos figure but nothing 100% confirmed.