Wizards of the Coast has just upped the ante on everybody. They're giving away the new version of Basic D&D for 5e for free. This PDF is designed to be a modern corollary for the seminal D&D Rules Cyclopedia that so many people view as the greatest version of the game.
That's right, they're so confident that you're going to love the new D&D that they're giving it away for free. Oh, and and they're going to keep giving you PDF updates that will make the Basic D&D game compatible with the major events.