Han Solo is supposed to open May 25, 2018, so a decision will have to be made soon.
THR also notes that Kasdan himself, an experienced director in his own right, could be the guy who ultimately takes over Han Solo instead of Howard or anyone else.
Ultimately, Lucasfilm chief Kathleen Kennedy sided with Kasdan, which meant Lord and Miller had to go.
Lord and Miller, THR claims, have “a comedic and improvisational style while Kasdan favors a strict adherence to the written word – what is on the page is what must be shot.”