What I was going on was what I have heard before, a few years ago, when I was checking them out for the first time. Every now and then I'd hear a note in a live song that just didn't sound right. Or an occasionally annoying sound to her voice. Don't get me wrong, WT do have catchy songs and she does sing nicely more often than not but, I always felt that she needed some more work on her voice. If she has improved, then good. The timing couldn't better, since they seem to be doing well.
As far as the the new NW singer being Astrid from Ambeon, the styles are different but, the voices do sound similar. Different band, different style of singing maybe? I guess we'll see in a few hours...