Imma come clean

[00Rinne]

The first one looks like he's in a 9-tails sasano'o with a rasen-shuriken-chidori variant. I say that because of the slight purple,orange blue coloring in the back.

But i guess we won't know until it's release.

 

[UchihasRightfulHeir]

Would make sense. That explosion is way too big for him to have made himself. And also from the trailer, I think the legend which boruto surpasses is Neji.