Marvel has decided to give away what could be a major reveal in the movie by making this change in the Thunderbolts* ...

But Thunderbolts is only a placeholder name for the team. In the post-credits sequence at the end of the film, the group is ...

An American Nazi force who all use the Punisher Red Skull logo very close to that used by these groups. And not one used by Marvel Comics for a very long time. Founder of Bleeding Cool.