Caskin's Ringing Swipe-It's on the same timer as lv 19 Taffo's Brilliant Blade. As per Moorgard's description it should be on Sneak Attack's timer. Bug it!
That is good news. I didn't mind so much but I often find now that I forget to use Sneak Attack at all, even though it still does ok dmg, by the time I remember to use it, my other attacks have refreshed and I go for them instead. It will be nice to have the haste and the dot now =) /bugging it when I get home!