I hope im wrong but i doubt it. frostbolt is getting an effective 30% buff and im not thinking that is going to be hitting hard.
UH DK has never been meant to crit as much as frost in single target abilities since UH has more damage sources. If SS crit for as much as obliterate UH would be so fucking broken.
The buff is pretty decent, still needs a buff to SR though since UH has no finisher without it.