Poser 7 should have an improved renderer. It will support multiple threading, better texture handling, and shouldn't crash so often when rendering complex scenes. For anybody who does a lot of rendering and has a dual processor machine, those sound like worthwhile advantages to upgrade.

New figures aren't much of a draw. The G2 figures haven't taken over the Poser universe and generally seemed to be something of a letdown. The P7 figures will come free with the program and will receive modest support, but probably won't unseat the DAZ figures from marketplace dominance. New generations of DAZ figures will probably eventually become the new standards for Poser/Studio figures even if they aren't markedly better than the previous ones, based on past experience. The base figures will probably be aggressively priced with expectations of making money off of morphs and apparel. The marketplace has changed, so it will interesting to see how quickly the new generation of figures get adopted and used. Anton already showed that there are ways to regroup Poser figures for more realistic bending, so maybe there will be some new design innovations. Everything is still limited by the existing boning system in Poser.