...also, is there anything that identifies "new content" versus prior included content?

I customize my Runtimes, so running a bulk content installer would probably add a LOAD of duplicate stuff into my runtime, since it is not in the original default install location. In the past there was installers for PoserAnimals.exe, Posercartoons.exe, etc...will there be a PoserNew112Content.exe, or something? Any other way to know?