So, I'm one of those that do not agree with a LOT of the morality presented in Dragonlance. I strongly disagree with some of the concepts.
That said, I LOVE Dragonlance. Just because I disagree with the ideas it presents if they were seen from a real life perspective doesn't mean I don't find it an interesting thing to read in the books or games.
One example is the Kingpriest. If you've read the Legends trilogy you realize there is no way in any definition that the Kingpriest is good. In fact, the best he might be able to be called is Lawful Evil. Even the book in the trilogy acknowledges that what he is doing is absolutely evil. Anyone good is transported/teleported/taken up to the heavens or whatever it is while the rest who are not good remain. The society itself in the book makes it obvious that the society isn't good, it's literally a exemplary one where evil reigns supreme.
To then say that the risk was the Kingpriest deleting evil is ridiculous in the campaign setting. If anything it was evil pretending to be on the side of Good.
I DO enjoy Dragonlance though. I plan on buying the book and the game when they come out.
ON that note though, the book is both a brief description of the setting and an adventure from what I understand. It will be a tad thinner on information than some other campaign books have been in the past. In that light, much like some other books that have come out focusing on campaign settings, it will probably be a little lighter on certain subjects, or at least I imagine it will be.
It will be an introduction to the setting that is sparse enough to let people make it their own. Much like the Dark Sun campaign setting was for 4e, or Ravenloft for 5e, I think it will cover the basics to get people into the setting, but not be so content laden that they can't reimagine whatever they want to make it good for their own campaigns.