Even the report that denied Hudgens's participation didn't deny that Leah was in New Moon. Why not say what screenwriter Rosenberg said if there's no Leah?
Screenwriters usually aren't consulted about casting decisions. They don't get the final say on who or what's in the shooting script. And I don't think the Twilight actors are being chosen for their reading of lines. So Rosenberg's statement is persuasive but not convincing.
Anyway, if Leah isn't in New Moon, it won't be a big loss. I gather she plays a prominent role only in the last two books.
And Hudgens could be auditioning for another Native role in New Moon. Or for the Leah role in Eclipse. So I doubt we've heard the last of this story.
For more on the subject, see Quileute Werewolves in Twilight.
Below: "I'm too cute not to be an Indian in New Moon. Don't you agree?"