They removed backstab advantage? I missed that. Seriously? That's awesome. So now, just height advantage, right?
Some caution is warranted: we are basing this knowledge off of video footage of a single(?) attack in Swen's playthrough. This was not mentioned in the patch notes or Swen's patch note video.
It's likely that it will be removed in the patch, but not guaranteed. It might just be something they were testing but didn't actually put into the patch. Or it could have been a bug where the game didn't properly recognize the conditions for backstab.