What news does scout overhear about Atticus defending Tom Robinson? Does it give her any comfort?

Scout and Jem here all kinds of rumours. THey overhear most of their information when Scout finds herself "in the middle of the Idler's Club."

you know the court appointed him to defend this nigger."

"Yeah, but Atticus plans to defend him. That's what I don't like about it."

Scout and Jem assumed that Atticus had voluntarily taken the job. At least the town knew the job was thrust upon him.