I don't think there is any further evolution of human even in the next billion years. Firstly, I don't believe in evolution because there are no accurate prove that we evolved from non-living things , then metamorphose into structure until we got to be ape and from different stage down to human. If evolution was real then human would have changed to a more complex structure from past centuries.
If there is any evolution human will undergo now, it will be intellectual evolution gaining more knowledge into the world and advancing in technology. This intellectual evolution has being developing rapidly judging from years ago to how the world operate in digital means transforming life into a simpler and less stressful means.
So in the next million years, it will be a brain evolution instead of a structural evolution. Many human have died from past years, if really there was an evolution that would occur again in human, they would have passed through the process before dying.
Merging with machines. It won't be biological evolution much longer. Boundaries between the biological and the non-biological will be blurred and disappear altogether. That phase of human evolution will be much faster than the biological phase that is about to end soon. Humans and machine intelligence will suggest improvements and those deemed best will continue to be used in the next round of development. It is completely impossible to foresee the results of that process from our very limited perspective.
The next, and last step in human evolution will be extinction.
Humanity will continue for a while as we may embrace trans-humanism and turn ourselves into machines little by little, until the point where no actual living, organic human remains alive.
Or we just nuke ourselves into oblivion.
Let's have a thought experiment.
Let's say we continue our civilization with a thought of preserving our physical biological bodies as the vessels for our thoughts, hopes, and dreams.
One million years passes.
It's the universal time 753209/Y/42/R/S/X2.
There's no human specie anymore.
Or rather, the thing that bothered us in the Sci-fi canon came true, and all humanoid life forms in known universe are referred to as humans.
Our civilization arrived at this reality due to spread of our kin and colonization of new star systems for the good portion of last million years.
there are currently many sub-species in our great family of Homo sapiens universalis.
Homo sapiens terran look the closest to the common ancestor, after all, it've been evolving in the most similar environment to the closest common ancestors.
Even there's still a certain variation of phenotype, most of them have long arms in relation to legs, slightly tan, smooth skin prone to discoloration. Body hair is optional. Eyes are big and round, ears are very small and flat. Individuals height range from 150cm to 250cm.
Homo sapiens stellar is another sub-specie of humans.
They are a branch of the family tree that have separated shortly after first self-sustainable colonies have been established in the vacuum of space.
Initially, those colonies were a checkpoints in interstellar travel, however, near zero-gravity conditions pushed people inhabiting it to adapt from generation to generation.
Their body looks almost nothing like their close cousins.
Both their arms and legs are very long and slim. Feet regained the ability to grab objects, common in other primates. Their core is on the other hand compressed, nearly round. A neck muscle make the head appear to be fused with the torso. However, it allows for nearly 180 degree rotation of the head.
Homo sapiens rt5s2 a sub-specie of humans which evolved on the surface of a hypothetical planet rt5s2 somewhere across the Milky Way galaxy.
The gravity on their planet is 3.2 fold stronger than that on Earth.
Even it was difficult to acclimate to such extreme conditions, and it took a good 1000 years before the first human being could walk the newly terraformed planet without a pressurized suit. New breed of humans finally became masters of their new home.
Short in posture, average 135cm tall, residents of rt5s2 developed superior muscle fibers, strong legs, short torso, long arms, and huge, relative to the body size heads.
You could go about inventing the ways humans can look in the future all day.
Millions of years from now if humanity still exist.Then i would say:
1. Human Cloning and genetic engineering using biotechnology
2. Accessing the unused portions of our brain
3. Man and machine symbiosis
But it is highly doubtful the earth can sustain human life for one million years unless we find a way to save the earth from global warming and its dwindling natural resource and the animals,insects and plants that support the earth ecosystem from going extinct.
I think the next evolution will be a spiritual one, and all cultures will be mixed. We are going into that direction. With spiritual i mean, a mentality change!
That question presupposes business as usual for the next few million years. I don't think that assumption can hold water at all. First of all, humanity has been developing technology for thousands of years and the pace of technological evolution is clearly accelerating. There simply is no telling at all where our species will end up with the ever growing power of technology. All bets are off as to what will happen in the next one hundred years let alone millions of years.