Having been a breif user of the Original Mudbox the video show some scope that they are directly competing with zBrush (Market leader for sculpting).

I would like to get my hands on it tbh, as I loved the Mudbox UI as it was less intimidating than Z's.

But without looking at it properly I would not like to state who can do what. Most of us are totaly aware of the abilties of Z. Lets see what Mudbox 2009 offers.