I personally think (and that's just conjecture as nobody really knows) that the next 'step' in evolution is already among us. We're walking more upright and getting taller (compared to eg. middle-ages). We live longer so we have to get more resistance against things that affect us in the long-term. Those among us that are actively evolving are what some of us call on the "autism spectrum". There really is not much explanation as to why anyone is on the autism spectrum other than that they have more of a very specific trait or intelligence (be it in mathematics or in words) and I don't think it's a problem really, it's us evolving into a species that needs to be more intelligent in order to preserve itself but also to advance technologically. Sure, evolution produces all types of outliers and mutations that we don't know yet how to be integrated into our current society but when you get closer to the Aspberger's Syndrome on the spectrum, we're producing highly intelligent, fully sufficient almost a subspecies that doesn't rely as much on the old classic communications we needed in the caves but those that we have gotten available to us know.
That and cyborgs.