User summary:
The March 20th playtest package contains substantial revisions across the board, and introduces the druid, paladin and ranger classes for the first time.
This playtest packet included:
Playtest Packet (2013-03-20)
D&D Next Playtest Update ("Read First", 3 pages)
How to Play (25 pages)
Creating a Character (5 pages)
Classes (49 pages)
Races (8 pages)
Backgrounds and Skills (6 pages)
Specialties and Feats (14 pages)
Spells (50 pages)
Equipment (11 pages)
DM Guidelines (23 pages)
Bestiary (91 pages)
Magic Items (31 pages)
Pre-gen: Dwarf Fighter (1 page)
Pre-gen: Dwarf Paladin (2 pages)
Pre-gen: Elf Ranger (2 pages)
Pre-gen: Elf Wizard (2 pages)
Pre-gen: Halfling Rogue (1 page)
Pre-gen: Human Cleric (2 pages)
Character sheet (not updated, 2 pages)
Dungeon Module B2: The Caves of Chaos (not updated, 23 pages)
Dungeon Adventure X1: The Isle of Dread (not updated, 44 pages)
Reclaiming Blingdenstone (not updated, 40 pages)
The Mud Sorcerer's Tomb (not updated, 34 pages)
Conversion Notes: Against the Cult of Chaos (not updated, 19 pages)
Conversion Notes: Storm over Neverwinter (21 pages)
The "Corrected" Playtest Packet (2013-03-21) changed only two files to fix errors:
Classes (49 pages)
Spells (50 pages)