Remix.
Rehash/retread carry with them inherently negative connotations that remix doesn't, which is why I think that specific term is being used here. The whole point of bringing it up isn't to complain about originality (again), it's to counter the shallowness of criticisms lobbed against the film, i.e: "It's just a dickless remake of A New Hope" This is showing that not only is it not that, but even if you wanted to focus your critical lens in that direction, it's a lot more accurate to say the film is essentially the ENTIRE ORIGINAL TRILOGY in one movie, as opposed to simply a remake of the first film. We're not bringing it up to shit on how "unoriginal" it is, we're bringing it up to point out that "It's just ANH but dickless" is a really superficial read.
I don't think it's just the recycling of basic "tropes" (ugh) or even standard monomyth shit, (although that, by nature, is going to come into play) but I think there was actually a conscious decision to break down the best parts of the classic Star Wars Trilogy, and apply them as needed to the telling of Rey's story. I can absolutely see Abrams/Kasdan doing that, especially since Kasdan wrote 2/3rds of it. I don't think that's a stretch, especially considering the primary creative force behind its making.
Johnson actually gave a pretty elegant answer to this during Celebration, I think the clip was on MTV News? Something like that.
But basically, by necessity it's going to lend itself to ESB comparisons because it's a 2nd act film. But Johnson apparently didn't pattern the film after ESB. Superficially, this is the "hero goes and trains" part of the myth, so that's going to be a similarity. But the way that happens, and the way all the other events of the film unfold, will likely be pretty different.