There is an in depth Q&A on the official page with Lead Content Designer Cory Stockton, here is that interview as well as recently released first look SS’s of the new battleground.
3.2 information is flooding out of the gates at a rapid pace, makes me think that a PTR will be up soon. Here are the DK changes and/or nerfs. You can see the full patch notes HERE.
Zarhym posted the next minor patch notes tonight that will bring in a Frost Presence nerf and PvP glove tweak for DK’s. Notice he mentions that this patch will not be on the PTR and will go straight to live servers. My guess is next week.