Linn never really wanted all the fame, and after the first album it took some convincing to get her to stay with the group. In part this was due to a stocker that broke into her home and scared the hell out of her.
Jenny, has moved on she wants a solo career. Not that she turned her back on AoB more that her style of music taste evolved into something other than that of AoB. She is perusing her own label.
That leaves the other two guys Ulf and Joker, they've never stopper wanting to do more albums, but they have all gone through the "family" phase and now that they are ready to return they don't want to loose the AoB name for the band. Even though they had talked about a new name it is stupid to toss out that brand name. Of course they have the blessing of Jenny and Linn to carry on the band and this album has been in the works for nearly 5 years. I'm sure it will be awesome now that they aren't under the previous record company dictating what they should sound like. It should be more like the first album that they are really well known for.
I'd consider myself to be a huge AoB fan with import versions of all their albums and nearly every single; they have been and always will be my favorite band I'm sure. Thanks for the link to the new single it made my day.