I'm kind of doubting that "bean" is referring to anyone. I love Sean Bean, but I've never pictured him as Ned. I won't be disappointed if he is cast as Ned though... I'd just prefer a younger actor.
David and Dan, I think it's great that you're getting involved with the fans :) It's very flattering that you come on messageboards to look at casting. Thank you for reaching out to us, I know both of you will do an amazing job on the series!