Here are some random updates regarding Death Knights via blue posts from the official beta forums.

Runeforging

Do Runeforge enchants stack with normal enchants?  

Runeforge enchants do not stack with other weapon enchants. But in most cases the runeforge enchants are better, and they are certainly a lot cheaper.

If you find yourself in a situation where an enchant from an enchanter seems superior, you are still able to do that. Furthermore, enchanters can still provide you with enchants for all your other slots.

Rune Configuration Swapping: What’s the plan?   

Here is the long and the short answer: 

We like the way the death knight plays with 2 of each rune — BBFFUU. Letting players avoid certain runes plays against one of the greatest strengths of the class — that you have to vary your rotations and use different abilities. Although it was our original design, I think it is extremely unlikely you will be able to swap out runes. I know some people will be disappointed with this decision, but we have to do what we think makes the game the most fun.I think you all can imagine situations in which a BBBBBU or BFUUUU configuration would be frighteningly overpowered or hideously underpowered. Theoretically that balances out in the end, but being at 200% effectiveness in some fights and 0% effectiveness in other fights just risks not being a lot of fun in a game where you control a single character.I do want to stress that the spells and talents were designed assuming a 2/2/2 configuration. It was never our intent that you keep say Unbreakable Armor up 100% of the time by playing with 6 frost runes. No single talent choice should be the difference between a good or bad death knight tank. (And to be honest, it really isn’t for druids.) A death knight needs to be able to tank end-game content with their core set of abilities combined with reasonable player skill and gear. Any bonuses from talents should just be gravy.

You are welcome to argue that their current set of tools isn’t yet up to that task. Having those discussions is a great use of a beta. But in the end, we’ll make sure they are up to the task. And that goes for whether the task is tanking, Arenas, soloing, end-game dps or justifying a spot in a raid.

Short version: You may not be able to customize your runeweapon — aside from runeforging enchants, which isn’t a bad perk — but you should be able to customize your talents to a degree that other classes might find startling. 

This isn’t so much Death Knight news as it is leveling characters in general, but as DK’s our trip through Outlands may be easier than we expect. Here is the question raised in the Beta forums from one of the testers: