A script following Marvel Comics character Riri Williams aka. Avengers 4 said to conclude the narrative of the MCU thus far, it's expected the franchise will begin to explore more and different characters in Phase 4.

With that said, movie about Marvel Comics' Eternals is in development. Beyond that, though, nothing else is known. However, a new script on the Black List may hint that Marvel is potentially looking to introduce legacy characters in future phases of the MCU.

Related: Predicting Marvel's Phase 4 Films

The official Twitter for the Black List, a resource where Hollywood screenwriters can  their scripts to be reviewed by industry folks like agents and producers, posted a link to a script titled IRONHEART by Jada Rodriguez. The one-line summary of the script confirms it's about the Marvel Comics character, who has connections to Tony Stark aka. Iron Man. Take a look at the tweet and summary below.

The Black List Ironheart

The full script for IRONHEART is only available to of the Black List, and it's unclear whether it's at all connected to Marvel Studios or the MCU. To be certain, it's not at all standard operating procedure for Marvel Studios to commission scripts that wind up on the Black List. Their universe planning and scripting is done in-house, and their desire for secrecy about their MCU films means it's unlikely they'd allow any potential script to wind up on a resource like the Black List - even if Black List scripts are only available to of Hollywood.

With that said, Iron Man to a new character like Riri Williams; or they're using it as a kind of writing test for Rodriguez before hiring her to pen a different project.

It wouldn't be too surprising for Marvel to introduce Riri Williams in a future MCU movie, since the character was introduced in the comics as the new Iron Man. So if Robert Downey Jr. steps away from the franchise but Marvel Studios wants to make another Iron Man movie, Riri is an option to take up the mantle - and fans of the character would no doubt love to see her make the leap to live-action. Still, that's all speculation at this point. An Ironheart script appearing on the Black List is curious, but it's not a definite indication Marvel Studios is planning a solo Riri movie. Until we know more, though, fans can speculate about what it means and what an Ironheart movie could entail.

Next: Marvel After Avengers 4: Everything We Know About MCU Phase 4

Source: The Black List, That Hashtag Show