In terms of biologic evolution, there is not a concept such as superior species or inferior species. All kinds of living beings evolve (in other words, adapt) depending on what environment they live.
Take for instance, a Shark, and a Lion. Who is the superior species? And who is the inferior one? It is impossible to compare if you don't take into account the environment where they live. Put a Shark in the middle of the savana, and it will die pretty fast. Put the Lion in the middle of the ocean, and it will also die pretty soon.
It makes me think of a definition of superiority... Maybe it can be measured by the capacity of adaptation in the most diferent kinds of environments. Thinking this way, we can say that humans are one of the most superior species on Earth, since they are everywhere, from the cold poles to the hot sands of the equatorial deserts.
The fact that the human species can adapt to all sorts of diferent environments is not explained by his biological constitution. Actually, humans are a very weak species. Without our tools and our brains, we couldn't survive in a wild world. In a distant past, our ancestors were stronger, more resistant, more agile, and faster. When the humans became more inteligent, they were able to change the environment around them, by building safe shelter, and weapons to gather food more easily, developing a strong social behavior. All of those achievements leaded us to the formation of a global civilization capable of adapt the environments to our needs. This development made us to evolve to a weaker primate, with less muscular mass, less fur covering our bodies, and weaker senses (touch, taste, hearing, sight and smell).
If we keep following this pattern, we can imagine that probably in the future, the evolved humans will look like the gray aliens we see in science fiction movies.
Conclusion: Biologicaly, humans are evolving, they've always been evolving, but this will not necessarily lead us to a more superior species. Moraly (or spiritualy, if you like) speaking, humans are and will always evolve to a more superior species.
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