It's all connected?
Well, actually it's not as Marvel Studios and Marvel TV are separate companies at Disney and don't get along (long story).
However, the good news is that it's looking likely that SHIELD is returning to the MCU.
SHIELD was "killed" off in Captain America: The Winter Soldier, and Nick Fury hasn't been seen since Avengers 2.
Now it's being claimed that the agents of SHIELD are involved in Avengers 4, as new set images have hit the net with a Twitter user claiming agents of SHIELD are on set.
It's possible they could always be a different Marvel government agency, similar to using Damage Control in Spider-Man: Homecoming, but with Nick Fury returning, Agents of SHIELD finally returning to the MCU seems probable. Agent Carter Hayley Atwell also looks to be returning for Avengers: Infinity War and / or Avengers 4, which is another potential sign.
Here are the Avengers 4 set pics:
The Avengers: Infinity War hits May 4, 2018, The Avengers 4 has a May 3, 2019 release.
As the Avengers and their allies have continued to protect the world from threats too large for any one hero to handle, a new danger has emerged from the cosmic shadows: Thanos. A despot of intergalactic infamy, his goal is to collect all six Infinity Stones, artifacts of unimaginable power, and use them to inflict his twisted will on all of reality. Everything the Avengers have fought for has led up to this moment - the fate of Earth and existence itself has never been more uncertain.