Gwyneth Paltrow posted some pictures on her Instagram account which hint at her greater involvement in Avengers: Infinity War.
Paltrow plays Pepper Potts, the love interest of Robert Downey Jr.’s Tony Stark/Iron Man. Over the course of his trilogy, she goes from his personal assistant to the CEO of his company, all while the two bond and fall in love. In Avengers: Age of Ultron we are told that they apparently broke up off-screen; nevertheless, they are apparently back together in the new film, and even engaged to be married. (Assuming they both survive, of course.)
Her pictures imply that she will be more than just Tony’s fiancé in this story, however. She seems to be wearing a motion capture suit, which means that she will need some full-body CGI for the film. This, in turn, means that she may be donning her own armor, becoming an Iron Woman beside her Iron Man beau.
This was theoretically set up in Iron Man 3, when she was infected with Extremis, a form of nano technology that gave people healing and other enhanced abilities. In the comics, however, Tony was infected himself and manages to modify the technological virus so that his armor fused with his body, allowing him to essentially turn into Iron Man at will.
Could the same be true of Pepper? Even if not, she has used “normal” powered armor in the comics at times, becoming the hero Rescue during emergencies. The attack of Thanos and his Black Order would certainly qualify.
No matter what, fans will likely be happy to see his popular character return. She made people love her just as a love interest, and if she becomes a hero in her own right now, that is even better.