Assuming that life began as a single celled organism and evolved from there to include an enormous variety of life forms, man presumably being the most intellectually advanced of them all, where will man be in say 5 billion more years? Will he continue to evolve? And if so, into what? To what extent does your belief system suppose that homo sapiens can continue to change, hopefully for the better?
5 billion years is a long time. humanity would go through a lot during that time span. for example colonization of space may result in physical adaptation, as we know from our modest experience in space exploration, space has an effect on the body, new physical environments will have new effects on the human physiology, and groups of people with different off world experiences can adapt to the new requirements they are faced.
as for changing 'for the better', I think we need to analyze this notion a bit. physiological changes are a result of several environmental factors, such as climate, so perhaps we need to examine what we mean by better.. are we talking solely about intellectual development or are we also talking about what the environmental experience of humanity and societies will result in.
physical evolution and social evolution may have a common fate, our social and ideological trends may result in physical changes, and vice versa.