What are the drop rates like in the various raids in Rift?

In WoW, the drop rates are random and somewhat ridiculous.
Is it the same for Rift? For example, how often would Crucia drop Windblade or Shroud of the Cyclone?

I ask this question for all raids, past, present, and future. I'd rather know what the drop-rate is like ahead of time, so that I know what I'm in for.