Marvel's What If...? writers say that they tried to get a Star Wars character involved with the show but that the idea was turned down.
In an interview with Colldier, head writer AC Bradley and director Bryan Andrews spoke about their involvement in trying to bring the two franchises together. Bradley said, "I was kinda notorious for trying to get a Star Wars character involved. We did try at one point but it's kind of like 'Play with the sandbox that you were given. We gave you the entire MCU, run with that.'" She then went on to say, "I was like, okay, but still, Luke Skywalker would be an amazing Avenger."
Despite no current plans to bring a galaxy far far away into the MCU multiverse, Andrews didn't rule out the possibility of something happening in the future. He said, "Who knows, if fans watch it and love it and clamour enough, in future episodes, who knows what can happen? Who knows? What if, right?"
Elsewhere in the interview, Andrews went on to say, "There was a bunch of ideas that were around and, who knows, maybe at some point we'll get lucky and get to go further. But first order of business was like, let's open up the multiverse off the films that we know, and then hopefully as things progress things can get wilder and wilder and more crazy."
Bradley then joked, "In Season 20, Baby Groot and Baby Yoda can have a play date."
In a separate interview with IGN, Bradley made it very clear that regardless of its animated style, everything within the upcoming series is being considered canon. From what we know so far, Chadwick Boseman's T'challa will appear in four separate episodes whilst Hailey Atwell's Captain Carter will return season to season as a character that acts as the driving force behind the series.
Per. Jared Moore. IGN.