I'm not saying I havent heard it, but I'm basing this strictly on the two songs that have been released (Lotus eater, and Porcelain heart).
I know that they were going back to a balanced sound, but a balanced sound could have been achieved in a different direction, say more melodic, or maybe not quite as dark, maybe more like... still life esque, or even MAYH. This being said they dont like to make a similar album. But they're all similar in that they have that "Opeth" sound.
edit
I dont mean heaviness as in growling bits, I mean heavy as in... jarringly dissonant sound. I do like that sound, but sometimes I think it could have been possible for them to go another direction and still be different.
on a side note, I HATE scott walker. i think its pretentious bullshit. its not too obvious in watershed and I like what Akerfeldt is doing with some of it, but sometimes I do hear it coming through too much (for example the keyboard section in the Lotus Eater near the middle ish, before the re-entering of the blastbeat).