Nice question but i think until and unless we do not get windows 8. we can not answer properly to your question. Any way as much as i know i think windows 8 is having much more features and functions which we did not have in windows 7.
1. Latest and best Browser by default like Internet Explorer 8 or 9 or 10. As it is not sure yet so we can not say it.
2. Exciting windows 8 Themes, it just looking cool. And totally different from windows 7.
3. And windows 8 is developed with the motto to make it more and more user friendly.
"People says 143. I say 444 i.e. Love Your Life"