CSS 4?

Hello,

Will there be such a thing as CSS4, or will the next step be an sort of 
XHTML-compatible XSL?

Is CSS a (dead end (in the middle to long term) or is it supposed to 
coexist wth XSL?

I don't want to start a troll, just give some pointers about that sort 
of discussion (if any).

Thank you

-- 
David