It was just confirmed, there will be a class tree for sentinel in which if you hold down the super button activators, you will cast a ward of dawn like in D1. I don t have a link to the original source, but here s how i learned
https://youtu.be/FyHgyQpbw6Q
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If Zavala's Ward of Dawn in the mission [i]"Homecoming"[/i] is anything to go by, it will probably drain the Super quickly and require you to stay in the Cast position while using it.