I'm also waiting for smooth zooming in the image viewer, as I suggested in this. 
While DOpus isn't a dedicated image viewer, the current zooming is quite laggy. Since the built-in viewer is the only way to browse images while maintaining the Lister's custom sort order, improving its performance is essential. Luckily, I haven’t been waiting for too long yet... though I’m not sure when we'll see the optimization.
But I still appreciate the many useful updates we've seen in 13, like the Evaluator and the QUICKSHOW—they are truly useful.