Dual Wielding question

[Roland]

I know it's a bit early for this question, but I'm curious and I'm asking it anyway.

When I was fiddling with the monk in beta I noticed that equipping a second weapon, even one that had greatly differing damage than the first, my damage on the LCS (I don't care that it's a new game and may or may not be lying to me. It's a Diablo character screen; it's lying about something) really doesn't change much at all. The damage number doesn't change if you switch what hand holds which weapon, but the attacks per second certainly does. What I want to know is exactly how it determines the damage added in from the offhand and how it calculates your attack speed because it's doesn't seem like it's just a straight average of the two speeds.

If each weapon has equal DPS, dual-wielding them will increase your overall DPS. Otherwise, if the gulf between each weapon's DPS is too great, you will actually lose DPS.