The asterisk in the title of Thunderbolts* suggests that "Thunderbolts" may not be the real name of the team. Resolves to whatever the actual name of the Thunderbolts is. The market may wait to resolve until the end of the month in which it is released (May 2025) in case Feige or whoever has a relevant post-release announcement.
An official change to the title of the movie is not necessary for this to resolve to something other than "Thunderbolts".
For example, remember how the very end of The Falcon and the Winter Soldier episode 6 showed a title screen switching to "Captain America and the Winter Soldier"? If Thunderbolts did the same thing, but with "Dark Avengers" or whatever, I'd consider that to be the name, even if the movie is still called "Thunderbolts*" on all the official copyright filings.
@ZaneMiller Ok, cool. So this is going off of the opening title card then? Or if the opening and closing ones differ…?
I'd consider the closing title card to be more relevant than the opening title card, but that was just an example of something that would count. If Bucky explicitly and non-jokingly calls the team the "New Avengers" at the end of the movie, I'd count that too.
I should probably clarify the description to make clear that this is more about the final name of the team than the film's official title.