Ok, so the new uniques are somewhat OP. The chest is, anyway. I thought they had a pretty good philosophy on uniques that they either supported some certain play-style or had drawbacks, etc, but I can't see many witches NOT wanting the chest piece.
Ring seems really nice for damage, but I'm sure some sick rares beat it out. It also doesn't have any life, which is good I think:
Shield, seems like a cool niche item for fire damage builds:
Robe, seems absolutely busted. Allows casters to ignore Chaos Inoculation, run auras from their health pool, run 'low life' builds without a lot of risk, etc. What caster build wouldn't want to wear this thing? Maybe I'm overreacting...