It is impossible (pun intended) to glean specific plot details from that shot, but it’s evident that Mission: Impossible will send Ethan Hunt (Tom Cruise) on an infiltration mission of some sort that requires him to perform a HALO (high-altitude low-opening) jump from the back of a cargo plane.
It’s almost ironic: Ethan fought so hard to get inside of a cargo plane during the events of Mission: Impossible – Rogue Nation, but in the next film he will jump out of one and plummet to the surface of the Earth.