I have yet to hear anything on the state of haste debuffs on dks. Every haste debuff I get, my rune regen are slowed by however much the debuff is. It's the same thing as Sindy. I've made posts on the official forums, here, and I've even sent in a ticket which was just ignored.
Can anyone post a link regarding DK's rune regeneration and haste debuffs? From the posts I've made, people say that it's not intended but if that was the case then I would have gotten a reply from my in-game ticket.