Is Mission Control an addition to Exposé & Spaces UI or a replacement?

Question

Lion has Mission Control that combines features from both Exposé and Spaces. Do the old Exposé and Spaces UIs still exist in Lion or does Mission Control replace them?

I've heard mixed rumors about whether Spaces/Exposé exists or not; and all the YouTube et al. videos/reports concentrate on featuring the Mission Control but won't tell straight if it is an addition or a replacement.

I understand, though, there are spaces—called desktops—on the top of the Mission Control UI.
There definitely are spaces, but is there Spaces?