Deadline claims that Ron Howard is the new director:
http://deadline.com/2017/06/ron-howard-star-wars-han-solo-director-1202118193/
It’s been confirmed by starwars.com.
“Lucasfilm is pleased to announce that Academy Award-winning filmmaker Ron Howard has been named director of the untitled Han Solo film.”
i am surprised they haven’t named this thing yet. maybe that is the REAL reason for the firings :p