I can already see for DH:

1.Bola Shot getting a massive buff.Either in terms of dmg or in terms of explosion delay (maybe from 1 sec to 0.5 sec)
2.Everything involving 'rocket' rune will get buffed in line with ballistics
3.Shadow Power other runes being buffed, SP as a base skill will probably have an inherent dmg reduction (maybe like 30% dmg reduction)
4.Companion will have massive buff in terms of dmg/animation/utility.The current one are too sucky(except for bat).I tried the wolf and it attacked like for only 5 friggin time before timed out.Wont be surprised if we get wolf as a companion with a disc regen.
5.Underused hatred spenders gets a massive buff.This one no comment, cos too much sucky spenders for dh but they are probably making strafe as a viable build.