yeah, they were out quite a while ago. Even 5th gear i think had it on one of their episodes a while back. But nevertheless its a very rare car and seldom seen on roads, not to mention public. I think its a one off production, unless there are orders. If I remember right these have price tags of US$8m.
Its actually called Maybach Exelero, debuted sometime in 2005.
Here is a link:
Maybach Exelero