But recently, thanks to info from John, I see that they are also republishing the original 1974 game (as in Original D&D or OD&D), as a set (all the books, and supplements):
- Volume 1: Men & Magic
- Volume 2: Monsters & Treasure
- Volume 3: Underworld & Wilderness Adventures
- Supplement I: Greyhawk
- Supplement II: Blackmoor
- Supplement III: Eldritch Wizardry
- Supplement IV: Gods, Demi-Gods & Heroes
It isn't available yet through amazon, but keep an eye out for ISBN 978-0-7869-6465-9.
The posting from WOTC is here, and states that the release date is November 19, 2013.