While I admit I am kinda curious over what the book is actually like I won't give WotC anymore money and have better things to do with my time.
As someone else who started with VtM/V:DA and such I have to say that DnD doesn't really have a very good social system but then again that's not its focus! DnD is about going on adventures, getting into fights, delving into dungeons. It doesn't really sound like they expanded much to help flesh out in those areas and while yes actual role playing of your character is important I do need the Insight, Persuasion, and Intimidation rolls cause Grace, Graceful, and socially astute aren't used to describe me.
In all honesty, I expect that it will be something of a mess. I used to play and run a fair amount of Adventurer's League but they just got more and more confusing and less and less creative. The encounters that you were supposed to talk and fight in weren't even hinted at, nor were they even specced out incase the players went another way. Last season I ran, there were so many "friendly" monsters that is was boring and most did a Heel-Face Swerve that everybody saw coming. Embers of the Last War for Eberron was terrible, just terrible. Such a waste of potential.
As far as the WebDM guys go, I honestly don't care for their content. They love to talk and talk and talk about, around and around and around about the topic but rarely if ever offer actual suggestions or solutions.