Lynn Allens Blog has an entry about a few new things coming in 2010. Since I just recently started with 2009, I suspect it will be a while before I can check this out first hand. However I will be eagerly anticipating the change.
I particularly thought that the hatch boundaries gap help was useful. I wonder if it will also work with Bpoly (boundary polyline) - a command I use when creating cnc files to create a closed polyline within a defined space. Gaps create problems with the cnc machine - so hopefully this will help spot errors prior to opening the file in the cnc software.