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The Champion reveal is likely to be tomorrow. Juggernaut has only received very minor numerical buffs to Unyielding. I have heard rumours that a small number of the other Ascendancy classes have received adjustments but you'll see these and the Juggernaut changes in the patch notes. Also to reiterate - Ascendant and Raider aren't receiving any changes I'm aware of in 3.7.0.