An apparently-leaked image of Gwyneth Paltrow in what could potentially be Iron Man Rescue armor for Avengers 4 has surfaced. Newsarama is unable to ascertain the veracity of this image, but take a look here.
The armor looks very similiar to Pepper Potts' Rescue armor from the Iron Man: Armored Adventures series.
Paltrow-as-Potts first wore Iron Man armor in the finale to Iron Man 3 - at one point possessing Extremis powers (which may be a plot point brought up in Avenger 4).
Of course, in comic books she has from time-to-time worn armor and worked under the superhero identity of Rescue.
The fourth Avengers film is due out in theaters May 3, 2019.