Basically, if it is an OBJ based, geometry mesh that is rigged in the Poser ‘style’, it is still usable…and in any version of DS, so far.
If it is a Triax (DAZ’s format) weight mapped figure…it’s usable in DS 4.0 and up.
If it’s a Poser 9/2012 weight map format…it’s not usable.
The first covers the vast majority of items/figures out there (for Poser/DS).