Nope DH is still upper/top notch bracket notch in single target fights :
https://www.warcraftlogs.com/statistics/10#boss=1853
https://www.warcraftlogs.com/statistics/10#boss=1864
You cannot argue that it is reasonable to have a spec with both a niche and above average performances outside of that niche. I'm fine with feral topping the crap out of every single target fights, they just cannot aoe. Cannot. DH is top single, cleave and aoe. This is too broad and will get nerfed, do not think that there is going to be any buff to anything to compensate, you'll get otherwise disapointed.
https://www.warcraftlogs.com/statistics/10#
Basically you can notice a pretty significant jump under Unholy DK, everything under that is pretty much undertuned, with another jump at the very top with the DH.
There is more dps difference between DH and the SECOND BEST DPS SPEC than there is between the second and the 6th best dps spec. That is the very definition of an outlier.
What to expect :
- Buffs to Frost mages, elemental shamans, all warlock specs, fury warrior
- Nerf to DH
You could pretty much bet money on those and have made a safe investment, the rest of the specs are uncertain to be changed because we don't know how conservative or savage the tuning philosophy for this tier is at Blizz.