It does seem likely to me that they picked Seawitch specifically for its four flippers and large number of drop targets, to give more of a sense that collectors will get something for their money beyond the license. Can't see them doing much to tweak or update the layout, since it's like Alien with the number of intersecting cross-playfield angles it has. Definitely doesn't look like a ramp-friendly layout, you'd have to redo much of it from scratch which would scupper the point of the exercise.
Let's see what they're prepared to do with rules and code, though I wouldn't be surprised if they kept that retro and simple in a 60s way.