Ya know, something that is just starting to sink in now, about two hours after the episode, is what we actually just saw. Naruto, with two attacks lasting about 15 seconds each, just utterly and single handly destroyed a foe who had taken a Rakuri to the chest and just kept going, solidly defeating Kakashi not once (before Shikamaru's intervention) but twice. And Naruto would have done it in a single attack if he had been able to hold the technique a little longer. All without 1) summoning a billion clones and watching them all go poof to no effect, 2) Charging in like an idiot with no forthought or planning, 3) doing his fox cloak thing, 4) getting beat to !@#$ before doing anything useful.
It may indeed be a whole new Naruto. Here's hoping at least.
edit:
Eh, I'm sure it uses more, but I'm not sure we can make to solid of a judgement yet as to how much it uses. Remember that they made a point to draw attention to the fact that he was pretty beat up and worn out at the very start of the fight. I think he was already pretty much running on fumes at that point, which is why he is so totalled.Seems like Rasen-Shuriken uses up a lot more chakra than his regular counterpart. Naruto was flat out after the second attack.