First off, they added a lot of features and functions I've been wanting for a long time... Haven't had a chance to check out everything yet, but here's my initial thoughts. I'll add to them as I use it more. We're just trying it out now, and not using it for production, yet.
I think the interface looks a little too drab... white/glue/grays...
You still can't use the measure tool between model edges and drawing sketch entities.
I though WPDM was going away, and being replaced by PDM Standard? Under add-ins, it lists Workgroup PDM 2016.