The good folk at The Indie Stone has released a new blog post detailing some of the non-npc things that will be released in the next update, and it looks good. Literally. The graphics and lighting engines are both getting some serious updates, although you can switch back to the older lighting system if you want to.
Another nice change is the memory usage. PZ now uses around a quarter of the memory it used in the previous versions, which is some nice optimization.
Lastly, they have promised to increase the flow of updates once this engine overhaul is complete. Once this comes out we can expect to see more dialogue options, female models, and more Kate and Baldspot storyline coming at us at a moe frequent pace.