You’ve been reading the forums, haven’t you? Come on, admit it! The forums are not for new players, except maybe the Newcomers and a couple of others. The forums say scary things that have no relation to reality, and will keep you up at night wondering whether something is coming to get you.
We’re all hardened veterans here, who know to discount 90%-99.99% of everything we read on the forums. It’s a skill you have to learn before you can be let out on your own. Don’t worry. As Juukiechan said, actual reworks happen only between expansions, and mostly don’t happen at all. Relatively small buff/nerf patches come and go, but most of the time you’ll hardly notice them unless playing competitively.
Where did you even see a DK rework thread? I haven’t seen …
Turns Pale. Starts Shaking.
You haven’t been looking at the (whispers) Class forums have you?
Looks around nervously.
Oh. That’s hardcore scary stuff you find in the (whispers) Class forums. Like, the aliens are actually here living as Old Gods under your town, growing tentacles under your house scary.
And just about as believable. But scary. Even I don’t go there. 
Ever since I’ve been reading, the class forums have been striving to prove the impossible proposition that every class is worse than every other class, and that their class needs a rework that will make them viable. Every class. Including the ones dominating the game at the time. 
There are occasionally really excellent, fact- and numbers-driven posts in the class forums. Very occasionally.
But don’t go there.
If you want to know about your class as a beginner, icy-veins.com is your first resource. To dig deeper, your next stop is your class Discord, which for DKs is Acherus: https://discord.gg/acherus
But don’t go into the class forums. At least, not sober. 