I'll be very curious to see how this plays out.
I'm guessing it will let daggers be slightly more viable, but still not ideal (since our specials are all based off of weapon damage, and I presume that slow weapons will continue to have a higher weapon damage than ilvl-equivalent fast weapons).
Also, if flurry continues to proc off of crits, the lack of an internal CD on windfury procs may make crit jump significantly in importance for us, especially considering that we'll never be able to diminish the 17% hit reduction from dual-wielding.