Cook:
"The goal here is to embrace all forms of the D&D experience and to not exclude anyone. Imagine a game where the core essence of D&D has been distilled down to a very simple but entirely playable-in-its-right game. Now imagine that the game offered you modular, optional add-ons that allow you to create the character you want to play while letting the Dungeon Master create the game he or she wants to run. Like simple rules for your story-driven game? You're good to go. Like tactical combats and complex encounters? You can have that too. Like ultra-customized character creation? It's all there. In this game, you play what you want to play. It’s our goal to give you the tools to do so."
Mearls 13 years ago:
"wizards and the way they approach spells is fairly iconic to D&D, but the chief advantage of a class-based game is that we don't have to lean on one magic system. We've already shown some subtle differences between how clerics and wizards use spells. As we show off more classes, we can show off more approaches to magic.
Vancian magic has been an issue in D&D since the first house rules in 1974, and I think this is our chance to offer people options there, rather than dictate things."