I don't think it will be as big of a change as anyone is thinking here. Forum tends to blow things out of proportion a lot. And I think the single main stat to melded gear is silly honestly. All you are going to do is force people away from pentamelds. This means objectively more tanks with straight slaying and less vitality than both vit and pentamelds setups. Essentially to combat this the vit meta will just be applied more strictly, not become less relevant. Single main stat jewelry will just mean more tanks with less hp, and a less interesting gearing setup with less demand on crafting accessories further alienating crafters from end game equip sales.

I highly doubt they will be adding new stats. It's possible they may add damage to vit but may cause issue regarding dps stacking vit and also it really does nothing to effectively change the active meta either way.