That is a good sign for the team.
If with starting gear, your four toons can basically take out a level 85.

Gear up your healer a bit, add in Resiliency.
And they won't be a one-shot deal at all.
Plus the DK's DPS will rise fairly significantly, with levels and gearing.



Assuming test stays the same, you'll be able to battle rez with the DK's for 50 runic power.
If it is the same as the druid version, each will have their own cooldown in world stuff and non-rated BG's, but share a cooldown in raids or rated battlegrounds.

Could probably duel between two of your toons, for the runic power if need be.