She's very interesting. I thought the what-if where She comes to Earth to avenge Hulk's death is an incredible story, for example.
I believe Ewing's offered a hint in the following twitter post (that I posted on page 24 from this thread)
TheRedeemer
@PeterPe47441356
Banner is a system of alters, how many alters are potentially inside there, do we eventually get to answering that question? Immortal Hulk mentions that him and Banner working together means he is the strongest, does that mean the more Banner works with each alter the more powerful that Hulk becomes? Meaning Devil Hulk hasn't reached his peak yet? And finally, is it possible for all the Hulks and Banner to work together turning them into some sort of Uber Hulk that could stand up to TOBA? Thank you and the team, keep up the great work!
Al Ewing Writes Comics
@Al_Ewing
The "together" thing is more about solidarity than some kind of Voltron-like combo - if Banner's alters work together, then can get more done than if they don't.
https://twitter.com/Al_Ewing/status/...092170243?s=20
That said, #33 will show one possibility for what Hulk could achieve if he acted without limit.