I am not really sure what to think about all of this, honestly...
What little we know about the new system actually reminds me somewhat of the alignment system of the videogame series called Ogre Battle, though I am sure the similarity is mostly superficial. In that game, alignment is judged on a scale going from the "low alignment" 0, called the Chaotic end of the scale, to "high alignment" 100, the Law end of the scale. Magical attacks based on Lawful alignment were called Virtue effects, and magical attacks based on Chaotic alignment were Bane effects. Healers, Paladins, Knights, Angels and Valkyries were Lawful. Vampires, Dark Knights, Liches, Berserkers, and all forms of Wizards, Witches, and Sorceresses were Chaotic. Beyond that, though, there was not a terrible huge emphasis on true good or evil in the system. At the very least, the heroes (who are pretty much the good guys) could use a mix of lawful and chaotic units, and you are just as likely to fight evil Lawful units as you were evil Chaotic units. I rather liked that system.
Actually, I find that I mostly prefer pure Law vs. Chaos alignments over good vs. evil alignments. Such a split was done very well in the videogame Fire Emblem: Radiant Dawn, for example. Of course, that split was done in pretty complicated manner, and mostly revolved around the idea that balance is far better than either extreme, since extremes tended to involve a lot of death and destruction...
Maybe they should have just gotten rid of the D&D alignment system altogether.