No change, not yet scientifically described and some debate what they are. They're reported to be from Rio Nanay. When I look it up that's nearly 200 miles of river, with no specific spot given. It could also mean a smaller, nearby stream somewhere, and not the main river, as is the case with some other species.
Personally, while I understand the reasoning for the hybrid theory and I've remained open-minded, I consider it speculative and unproven up to now. One of the arguments is no one has seen or filmed rotkeil in the wild and some hobbyists have gone to search and not found them. This may not be entirely true, for example a friend of Jim Cummings may have collected them.
For as many who say they're a hybrid, etc. there are respected sources who so they are not. I specifically asked Jeff Rapps about this some years ago, he essentially said those who say hybrid don't know what they're talking about, don't have the connections and sources he does, and you should understand that collectors sometimes keep locations for certain fish to themselves, something I know has been true with some other fish. Oliver Lucanus recognizes rotkeil in his Heros video (link below), but doesn't actually show them in the wild-- more fodder for the hybrid theorists.
Some have said
show us the fish in the wild. To this I've said
show me your speculative breeding ponds. Then someone will say
it's a huge area, they could be well hidden. To which I say
right back at you, the same argument can be made for their wild location. And so it goes. I've kept an open mind, but it's a little like string theory in physics, a popular but speculative theory, still unproven after decades of trying, while it's been criticized by some physicists. As long as there's doubt people will fall on both sides of the question.