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Now, obviously Naruto is doing some kind of training with a new jutsu.
Whether it is close range or long range we don't know.
If it was close range then Naruto is using his shadow clones because he is very far away from those trees. If you look a little to the left of Naruto you see a small bridge close to the trees. If you compare the size of them you can tell that Naruto is very far away and that they are enormous, a lot bigger than most. It would take a powerful jutsu to cut through that completely, obviously he has been training a lot.
I doubt he was training with shadow clones because if he was he would've picked a spot with a lot more targets seeing as he already destroyed the ones here. If he was training with mass ammounts of shadow clones he would've picked an area with more targets. So I think that he was using a long range attack with one or two clones assisting him, possibly Rasenshuriken.
We know that Rasenshuriken is a close range attack, but it is possible for it to be a long range one too. Also, Naruto mentioned once that he has to keep practicing this technique in Sage Mode. Why in sage mode only? Its because Sage Mod uses Nature Chakra. How is that helpful? Well, Naruto could ancase that Nature chakra around the Rasenshuriken so that it can maintain its form while being thrown at the target. There is nearly an infinet ammount of Nature Chakra also so he doesn't need to worry much about it running out in mid-air.
My prediction is that Naruto is learning to use Rasenshuriken as a long range attack, thus perfecting it so that he doesn't do damage to himself. I doubt it will be easy and I think he needs to train a lot more to master it.
Thoughts? ^^