I suspect the closest you'll see to "Poser 4.5" will be the next major version of "Poser Artist" (if we ever GET a "Poser Artist 2" that is). Because reading between the lines it'd seem that future versions will likely be basically a version or two behind the main full price version of Poser. It's be quite unlikely for any vendor to do work on an obsolete/outdated product unless they believe they've got a significant market for it (by which I don't mean a fraction of the existing marketplace - us). IMHO they'd do better to follow previous promises and DAZ3D, and produce a new version from the ground up (as unlikely as that seems).