DH as a whole has been a strong class I'd say. Not an overpowered one but we had area to shine and despite having some issue at some point playing either Havoc or vengence wasn't a bad choice.
Do you fear the class will fall off the dev radar and sink down or remain strong since its a popular class ?
Personaly if I had to bet money I'd say the class will be middle ground. I don't base it on any info that I have just my feeling after playing WoW for years lol.