Over the last week or so rumor sites were posting that James Mangold and Robert Rodriguez would be directing episodes on The Mandalorian Season 2. This hit a peak yesterday when bigger sites such as IGN picked up the rumor and ran with it, and it appears to be completely false.
In a Tweet replying to Ron Howard, James Mangold says he’s not doing The Mandalorian Season 2 and never even discussed it:
Hey Ron. I'm so pleased if it's true about Bryce directing another part of Mandalorian, but I can tell you its not true about me. Not doing it, never discussed it. And I suggest fans should look at who's "reporting" this & make a note that these sites present conjecture as fact.— Mangold (@mang0ld) February 29, 2020
That seems pretty definitive, and the sites running that seemed to really make him mad as he then talked about sites using another rumor site as a source.
The Mandalorian Season 2 arrives in October, and it’s obviously going to be awesome, it’s just not going to have James Mangold involved.