I really liked the "risk breaking your weapon on a natural 1" option. It's fun that something tactically interesting happens on a 1. I do wonder how it will work at higher levels, when PCs have magic items to risk. Would you risk breaking a +3 sword (resale value 1800GP) to reroll an attack in a level-11 encounter (expected loot from the whole encounter about 1800GP)?
There might NOT be magic weapons at all...
WOTC might simply implement the "inherent bonus" system that was detailed in DMG2 and can be checked in the character builder.
Indeed, I would bet 50/50 that DS uses it.