One of the things about the new figures that actually is kind of cool is that we don't have all the UV's overlapping in the 0-1 space. Load the figure into UVMapper or another UV tool and you'll see the UV's are spread out. This makes it a lot easier to see what goes with what on a texture map and why using the Group by UV feature in ZBrush or Auto group with UV's is pretty handy. Just run that and then hide the stuff you don't need for the texture you're trying to export.

The head, inner mouth, tongue, eye sockets and tear ducts are all one map. The body,fingernails and toenails are all one map. The teeth and gums are all one map (though texture space could have been used a bit better there). The eyes and cronea are all one map.

So be sculpt away and just remember that you can group by UV and hide what you don't want to create a map for. You can hide groups in ZBrush by holding down the CTRL key and the SHIFT key  while left clicking on a group.  One click hides anything not a part of the group you clicked on and another click into the same space will invert that.