There is a slight difference conceptually. The goal/concept of CSS is to simply html AND provide a means to generate advanced layouts (while keeping the simplicity). The goal/concept of Sass is to speed up the process of writing CSS because well, even if you know what you want, it's pretty damn time consuming. (Note: I say the exact same thing about html and will prove a `post script`.)<p>And when I said it would incorporate some of the features, I  really meant "Eventually CSS may become a very primitive scripting language with variables and functions," but I didn't quite say that because at the same time I'm thinking "JAVASCRIPT!" So to be honest, imho, CSS will never incorporate anything from Sass- ever. However, there is a good chance <i>text editors</i> (inferable via my `post script`) will.<p>P.S
I recently pounced upon a project called zen coding: <a href="http://code.google.com/p/zen-coding/" rel="nofollow">http://code.google.com/p/zen-coding/</a><p>Does pretty much the same thing, but with html. It's a plugin and there is support for different editors. It's pretty awesome- By does pretty much the same thing, I mean it allows you to write html code very quickly by writing in a "shorthand."