I've looked at the press release at the e-on site, and there is nothing there that implies exclusivity; just that the 4.2 upgrade will allow single frame pz3 import from P5, and Mover4.2 will handle animation sequences from P5. The only differences, since the dynamics aren't included in this, is the shader node compatibility...and I believe that the backbone of that was implemented in the 4.12 upgrade. As P4 is still an available for purchase item, It wouldn't be too bright to void it's use. Maybe we should wait and see just what goodies are in the readme...?