There are of course notable exceptions, however it seems to me to be mostly theorists warning of forthcoming apocalyptic change. The environment or economy is going to crash. We will lose our culture/languages. We are facing a philosophical crisis, were people are becoming beings without ideas�
What science fiction has done a good job of is tackling question of what we will look like in thousands or hundreds of years. It does so on a number of different levels. First it does not simply look at how we will look (biological evolution) and how we will act (psychological evolution), but more how we will organize ourselves; what philosophical questions we will have to face and how will our environment be different (sociological, environmental, philosophical, etc. evolution).
Although often relegated to a pastime of nerdom, movies and books such as Starship troopers, Ghost in the shell, the reality dysfunction all seek, not to answer these questions, but confront them, that is, to ask ourselves "what would we do if:" (computers developed a conciousness, we were able to engineer ourselves or mechanize ourselves to oblivion, we changed our definition of who could be a citizen).
The second dimension that science fiction tackles about our evolution, is the nature of the speed that it will occur at. We all grew up on the cheesy ass "25 years in the future" movies that predicted that we'd all be on super drugs, that our high schools would be HQ for the robot wars of 2003, that we'd be running form a thing called HAL as we were off in space. This wasn't necessarily a bad thing, namely because it asked an important question which was, "if we're going to change, how fast will it occur?"
Will we be predominantly different in 20 years? How different? What about 500 years? I mean I know we are going to be different, but HOW different.
A monologue in waking life addressed this beautifully:
"If you're looking at the highlights of human development, you have to look at the evolution of the organism, and then add the development of the interaction with its environment. Evolution of the organism will begin with the evolution of life, proceeding through the hominid, coming to the evolution of mankind: neanderthal, cro-magnon man. Now, interestingly, what you're looking at here are three strains: biological, anthropological (development of cities, cultures), and cultural (which is human expression). Now, what you've seen here is the evolution of populations, not so much the evolution of individuals. And in addition, if you look at the time-scale that's involved here: two billion years for life, six million years for the hominid, a hundred-thousand years for mankind as we know it, you're beginning to see the telescoping nature of the evolutionary paradigm. And then, when you get to agriculture, when you get to the scientific revolution and the industrial revolution, you're looking at ten thousand years, four hundred years, a hundred and fifty years. You're seeing a further telescoping of this evolutionary time. What that means is that as we go through the new evolution, it's going to telescope to the point that we should see it manifest itself within our lifetimes, within a generation. The new evolution stems from information�"