Poser Pro 2014 has the ability to combine material nodes (so say, bagginsbill could put all the nodes that people shouldn't mess with unless they know what they're doing into a single "master node") which won't work in earlier versions of Poser, but that's it for non backwards compatibility.

One other detail is that Poser 10/Pro 2014 will render faster on a machine than Poser 9/Pro 2012 will, due to enhancements in IDL calculation and other render engine improvements.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.