Yeah, he gave the letter to Emma in the Season 4 episode "There's No Place Like Home" after telling Norma that Norman may have had something to do with Audrey's disappearance but Norma refused to admit that Norman could have done anything to her

Yeah, Dylan gave her the letter last season

She said at the Emmys that she had no idea where the rumours she was leaving came from so this means she's sticking around for Season 5. It's too early to say if there will be a 6th season

Connie Britton confirmed that she's not going anywhere. She's in it for the long run

They've always planned it as a 5 season show and it was confirmed last November that it will end next year: http://www.vcpost.com/artic…