Well, I'll miss Johan's live vocals, which I think work very well.
I'm not sure how much I will notice that Fredrik is gone myself, seeing as I haven't seen them live (first time will be now in December), I can't really say how much will change in a live-setting.
As for how they sound on album, I hardly doubt much will change there.
Sure Johan and Fredrik would give their opinions to "form" songs, but in the end it's still Daniel Gildenlöw writing and playing a lot of things (just check the credits in Road Salt), so I hardly doubt they will change much sound-wise either.
Looking back, the directions they've taken when they've changed sound, that feels very much like "Daniel wants to do something new, so the band does something new", no offense to the others obviously.
