Everything is still evolving; look at "drug-resistent" bacteria. Evolution is how they got that way.
Evolving into what depends on selection pressure and environment. If humans begin to live and breed to space for some generations expect to see significant changes. Not sure what they would be.
As far as different sub-species of humans--no. Some anthropologists (such as Montague) question whether there are even human races. There are a lot of difference between and among groups, both in classical racial traits (skin color, hair color and form, etc.) as well as genetic traits (fingerprint patterns, blood types, etc.), but there are huge overlaps. Dark skin, for example, is a trait of hot climates and says little about descent.
All of these are fascinating studies!