Some things of note:
- Increased Attack Speed will be nerfed.
- Drop rates and availabilities of items in late Hell and Inferno difficulties are being adjusted.
- Inferno difficulty adjusted (no more Act 2 ‘wall’…in theory at least!)
- Class Skill tooltips for certain skills are being updated.
- Repair costs significantly raised.
- Artisan costs (materials and gold) reduced.
UPDATE: Full patch notes here.