Datto has posted a video detailing how they have. He explains what some perks were called to what they are and new abilities that have replaced some.
In short and according to Datto, Sunbreaker received the least amount of change while the Nightstalker received the most.
Discuss whether you like the changes.
Personally, every change to the Nightstalker was awesome.
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2 RespuestasReserved for bumps
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1 RespuestaWarlock getting a longer ranged melee by default and then an even longer one with a perk. Not to mention they can pick a perk that gives them full melee energy when hit and the hit damages said enemy.