I'm looking forward to seeing what the cloth room changes will be. And I'm always interested in what's included in the "other smaller features". Some of my favorite improvements come from there, like the improved hierarchy menu and other lists and the inclusion of some of the missing cycles nodes. 

And a better preview would be nice, unless it slows everything but the most powerful computers to a crawl. I only just recently got a computer that can handle having the preview shaders displayed.

Unimesh (not the Daz gen 4 unimesh) was planned to be in 13 but they weren't able to implement it.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

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I use Poser 13 and win 10