At San Diego Comic-Con, Marvel Studios head Kevin Feige unveiled Phase 4 of the MCU, and for the very first time, the lineup included TV along with the usual slate of movies. The announcement detailed how some shows will directly lead into upcoming movies: for example, WandaVision will establish Elizabeth Olsen as the Scarlet Witch so she can subsequently show up, fully-powered, in the film Doctor Strange in the Multiverse of Madness.
Feige also noted that some shows would explore the gaps between the movies: the Hawkeye series will reveal what Clint Barton was up to during his time as Ronin. It was an exciting presentation that promised huge things for the franchise that fans worldwide have fallen in love with, but it’s hard not to feel a certain sense of disappointment that it took this long to get a fully interconnected slate of Marvel movies and shows. After all, that was the promise from the beginning.
Source: IGN.com Phase 4: Marvel's Movies and Shows Should Have Always Been This Interconnected