Keep in mind that they'll also have an iTunes bonus track or two, and possibly a different bonus track for China.
Maybe they'll use acoustic versions of some of the songs for their iTunes bonus tracks like they did on Viva La Vida.
Also, I think it's unlikely they'll have a new song as every b-side for every single. That would be fantastic (!!!!), but realistically, I don't know.... I mean, did they use a new song for every b-side when they released Viva La Vida?
P.S. Oh, I think this is my first post! But I've been here since 2008. Hi everybody!