Been too long since I've posted anything but still like to come and read what people are saying. However, for this chapter, I'll put my two cent ( even if I'll repeat most of what people said already

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I'll say even if I don't like Hinata, I was actually happy to see her stand up and actually help Naruto for once ( well, she did that too on the chunnin exam before Naruto vs Neji but it been so long since that moment and after that, she did nothing to him IMO). I consider it as NH (even if I'm an hardcore NS fan, the way Hinata still let her hand in Naruto's cheek and Naruto's progress to take out Hinata's hand only to held it, I found it extremely sweet).
The fact that is happening with Hinata and Naruto now, means that there won't be NH.
When a protagonist is fulfilling something that resides in the view of a side character who's interested in the protagonist and before the manga is far away to end, is part of a classic manga way, meaning for the fact that it's happening now, not near the end to just add this, is a sign that they won't be together and next, this side character won't have another big spotlight like that one that he/she had.
Yes, this chapter is good for a bunch of hints of NH but not in the way of them being possibly canon now or in the future.
This is what I think, thank you for the good post. You can't consider Hinata's grow without Naruto since Naruto is what she's stand for. Chapter 573 confirm that long before chapter 615 that this would come so I wasn't surprise to see it. However, this is like in chapter 573, each will have what they said and since Hinata was the first and the longest, it was logic to me that she would have the longest development of all so I expect at least 2 chapters with her. Then, after that, we'll have the rest of the people that did there speech in chapter 573 and to me as soon as we see the others shine, I think that it will be the last that we'll see Hinata shine and being in the front seat.
In continuation of chapter 573, since Sakura's speech was last ( and quite as long as Hinata's) I expect that her shinning moment will be at last and I do believe that she will have her moment before Sasuke come, I expect maybe all the rookie standing by Naruto's side and Sakura saying to Naruto ' You see Naruto, not only me but EVERYONE stand for you, wanting to help you so you're not alone' and I expect Sakura to be in the front seat because she is the heroine, she'll have the final moment and the best part to make Naruto realize that he's not alone and to me that will beat Hinata's speech as competitor of who's the heroine in my opinion.
It was a big moments for NH, congratulation for the NH fans, but to me it will take alot more then that to see it as a cannon. It hurt the NS big now but unless we see Naruto actually showing more then friendship support toward Hinata ( sorry but there are indication in this chapter that he still consider her as friend, only this time he acknowledge her more) and him showing that he no longer love Sakura, I say that we're still are in the lead.
I really like Kurama's speech, reminding that before this all of this happen, that he has his parents live on him. Hinata's speech was sweet and very convincing but let's not forget Kurama's, I don't give Hinata all the credit because if it wasn't Kurama's speech about his parents, Naruto would still have some doubt about all of this. The 'Thanks for staying by my side' from Naruto to me feel like he's thankful to Hinata for staying with him during this moment, the fact that she help him regain confidence in his belief but I didn't feel like it was because she was always by his side because she wasn't, she was always in his shadow, watching him form behind and doing nothing to help him, even when he need it most. The only thing that I didn't like much was that Naruto look weak in the last two chapter, not the Naruto that grow to like. However, as bad as it look like, to be able to let the secondary character shine, you have to let your main character stay in the back seat, it's hard but it has to be done but I really can't wait to see Naruto standing on his own, looking at all of his friends, then smile and with a determine look standing like a leader he should and I hope he will be.
As for Sakura's panel, I didn't consider it as jealousy and frankly, I don't want Sakura to be a romance devise like I feel like Hinata is, I want her to be the heroine like I think she still is, even after this chapter so I don't want and I don't think that her expression held jealousy, I think it held shock about Hinata inspiring words.
Overall, as crazy as it may sound, I still have faith in kishi's writing, I don't think he fail in showing Hinata taking that lead ( for now), I wait and see what he's planning because there is still a lot going on and to me it's far form being over, the pairing war, I expect more NH and of course SS so I'm prepare for this lol However, before pairing hints, what I truly can't wait to see is Sakura shining moments, that's what is important and I still believe that Kishi will do more on her, more then just romantic device and being so far what I always see in her, the heroine.
For now, I'll continue to enjoy the rest of the war and stay patient that we'll see NS and mostly Sakura moment. Like some have already stated, after every NH and SS, there is always a NS and since now we're having more development for NH and later SS, I expect a big NSlater, I'm just being patient and for now, enjoying the rest of the action