Finally, I wanted to share this last bit of exciting news with everyone. After conferring with our various trade partners, the Sales Team here at Wizards came back with word that they'd rather have the three core rulebooks release in the same month than over three consecutive months. As that's how we originally wanted to release them, Brand and R&D got together with our Production Team to see if we could accommodate the request.
The answer is YES! The new release schedule looks like this:
April: D&D Miniatures Game Starter and Dungeons of Dread boosters.
May: H1: Keep on the Shadowfell 4th Edition D&D adventure with Quick-Start Rules.
June 6: 4th Edition Player's Handbook, Dungeon Master's Guide, and Monster Manual.