They arent. Its Blizzard we are talking about, they are going to do just enough to get by with doing what they said they were going to do. They even said they werent going to do any major changes to the specs overall.
If its going to be released this year, and we arent even in Alpha yet, there isnt going to be anything major over what we are seeing now because they dont have the time.
They are going to test Covenants and the forge, the zones, maybe if the abilities they brought back is working as intended and some of the other alt friendly systems. They are even doing a level squish so they have to make sure all that is working properly with all the scaling.
2h Frost, or fire dk which is against dk lore by the way, isnt on anyones desk to even look at.