I really don't get what this means. Was their already a Executive Creative Director that he is replacing, or is it a new position? Wasn't he already heavily involved with at least the TV and film parts of Star Wars? I mean, he does decent to sometimes great work (The Mandalorian and parts of TCW), but also sometimes does mediocre to terrible work (Rebels, other parts of TCW).
I guess that I already thought he was in a position like this, and I doubt we'll see much change in Star Wars media. Since I like most of the live action stuff and tolerate most of the other stuff (outside of the novel division, that is just irredeemable at this point), I don't have any particularly negative thoughts about this. I'm not going to say its a great decision, but it doesn't really bother me either way. I just hope we get more of the Mandalorian quality stuff from Filoni instead of the Rebels quality stuff.