After playing through a few games of Age of Sigmar, it's very clear that it is no relation to WFB. It's not a new version. It's not a spiritual successor. It's a totally different style of game that happens to occur within the same setting, but should not be considered in the same genre. Which is sad.
I do think AoS has the potential to be a good game. I'm just not sure why GW felt they had to take away WFB as well.