Of course, all of us want different things, based on what we are actually doing.  I don't care about Poser's default rendering engine, because, thanks to the modularity of Poser, there are several available - Vue, LuxRender, and Octane, and the Reality 3 plug-in will be along shortly.

I am personally more interested in under the hood changes - I would really, really like to see the python subsystem on it's own thread instead of hogging the main thread.  The ability to run Wardrobe Wizard as a separate background process, like the render engine would be enough for me to purchase the next version of Poser Pro.

Oh, and better memory management - my system gets baulky when I go above 3gb in Poser 2012 - I have 22gb of ram, I want to use all of it.