I can definitely see where you are getting a KW vibe. There's an oriental feel to the progression. I like the new single, but it strikes me as being a bit odd if only because the vocal harmony chorus feels almost like a bridge to me. I keep expecting one more motif. But other than that, I think this one song at least sounds like an progression on what he was doing on Watershed taken in a more groovy, 80s metal direction.
I still like Heritage. It's not my favorite Opeth album, but I think it's as good as a big chunk of their discography. Though I can see why some Opeth fans are put off by it. You don't hear much continuity between it and early Opeth. You hear Åkerfeldt's early metal and prog influences filtered through later Opeth.
I think Mikael is correct to note that this new one sounds more like a cleaned up version of an 80s sound rather than a vintage 70s sound or a really full and compressed modern mix.
ETA -- Finally put my finger on what Cusp of Eternity reminded me of...it has the same vibe as Derelict Herds, one of the bonus tracks from Watershed.