Well, the definition of a biological "species" is that any male member of a species can mate with any female member of that same species and produce viable,
fertile offspring (assuming both members are normal and healthy). I highly doubt that humans will be so different in the next generation that they'll be unable to produce offspring with humans from their parents' generation. Unless that happens, our children and grandchildren can't be considered a different species.
He said that no one really knows the reasons behind the increase in autism and all the other stuff (synesthesia, dementia, etc.). If he was suggesting that it may be due to the increased demands on our brains, then evolution doesn't work in the way he's suggesting. If there's an increased demand on brain activity in a mother and father (for example, if two parents go through a highly rigorous academic program like a Ph.D or Master's degree), that experience won't be genetically transmitted down to their children. They won't be born smart just because their parents are smart. That's the Lamarckian theory of evolution, which has been proven wrong.
I'm not sure Juan Enriquez understands how evolution and the genome works. I checked his
profile and
Wiki page and they say he earned his MBA from Harvard School of Business, is a CEO of one company, a chairman of the board of another one and serves on the board of several other companies. He's a businessman, but he's no scientist.
If I've missed the point of the video and it turns out that he's actually talking about using technology to manipulate genes, well, even that's still a long ways off. It's one thing to take a mouse skin cell, turn it into a pluripotent stem cell and redirect it to differentiate into a completely different cell type. It's another to make the same technique work for human cells. And even if/when we get past the technical barriers, there's still going to be ethics panels, moralists, conservatives and lobby groups who won't let this kind of thing fly. I don't think anyone's going to use the technology to create a whole new species of super-humans anytime soon. At least, not in our lifetime. He's talking about genetically enhancing athletes in a world where injecting erythropoietin, a naturally-occurring substance in blood (a.k.a., blood doping), is illegal.
Still, it's an interesting talk, and the idea of downloading memories into another body would be pretty awesome.